The scenarios and difficulty resolving your faction is heavily influenced by your member size.
I also do not have any experience with communities exceeding 20 members or more. It is advised to adapt to your own playstyle and use this information as a convenient tool and not as a guideline.

A save system resolving around a consumable item.
Invisible strain infection threatening to wipe out factions.

This mode plays a lot into risk for early game due to the low amount of safe files.

It becomes increasingly difficult to raid a base and take over their resources with the limited amount of quick saves.
It is also difficult to build your own base in peace with the hordes and bandits attacking you repeatedly.

Option 1 is heavily relying on finding a friendly settlement and getting friendly with them by completing quests. It could make your missions easier too if you recruit survivors, but make sure to not anger the faction you're friendly with. They don't like poaching.
You can build a chest nearby and store your stuff there. A trick to keep it secure is to surround your wodden chest by wooden fences and one wooden gate in front of it. You'll receive the option to lock the gate.

Option 2 is a more violent approach. Look for a small community around 5 members or less. It should be easy to sneak kill all of them without getting caught at all with a survival knife. This doesn't require any skill points to accomplish due to the amount of blind spots you can take advantage of and the ability to assassinate for free.
The food inside their cabins should be enough to keep you fed for now.

You can poach from virtually any faction and violently recruit unwilling survivors by eliminating their factions.

Poaching from any faction will result in negative morale aimed towards that character, leaving a negative memory that can stack.

It is advised to recruit survivors with a secondary character and not your main character to avoid a negative reputation, because it will affect how your own survivors see their leader in a negative light.

It might seem random on wether you can recruit a survivor but it is heavily influenced by their respect and like parameters towards their recruiter. Enemy factions will always have negative like but wether or not they have negative or positive respect is on how you present yourself in public.

Eradicated factions with only one or two survivors will have large amount of respect, easing the difficulty of recruiting them to practically zero.
But this comes at a cost.

Morale is heavily integrated within the community and survivors individually. One unhappy survivor will dampen the mood of the entire community and will cause morale to plummet overtime.

The problem with morality is the difficulty of increasing morale once it's gone into the negative.
Negative morale will create bad events, to worst case leading to infighting and desertion.

The best way to avoid negative morale in the first place is prevention. Have a toilet, bed and food ready before you start recruiting new survivors. And avoid recruiting enemy factions in general.

Every faction have their own morale to deal with.
Positive morale equals happyness for your survivors and a good mood overall.
Negative morale equals sadness and will cause events that cause your survivors to fight each other, lowering morale even further.

Morale itself is based on a memory system. Survivors experience events and are left with memories of these events, gradually losing these memories over time.

Too many memories will result in old memories getting lost or replaced.

The negative morale points that can be easily avoided is:

• No shelter
  
• No Toilet
  
• No food
  
• Getting attacked
  
• Losing a faction member
  
• Leader has a bad reputation

The invisible strain can be seen as a hidden mechanic that wont influence you too much.
The only times this will become a problem is if you have it enabled, and you're running a large community with no sure way on supervising your members.

Small communities also face the problem of catching the invisible strain but the consequences can be considered minimal if you're an experienced player.

The invisible strain is an infection that will turn survivors into undead spies that infiltrate camps for the sole purpose of infecting more survivors to increase it's carriers.

The main cause of concern is when over 50% of your community has successfully caught the invisible strain. This will cause all of them to turn at the same time, leading into a giant horde attacking your faction from inside your base.

You could easily trap the zombies by keeping the doors closed but in general this can lead to game ending results if handled poorly.

There are ways to fight against the invisible strain by screening new survivors with the brainscanner or to separate your good survivors with the new survivors to avoid it spreading.

Every Faction have their own opinion that also affect their own survivors.

Two bases can get into a fight with each other for simple conflicts like theft or dislike.

You can rarely see massive waves of survivors attacking other survivors for no reason but this can also be a boon.

A lot of dead survivors will result in them dropping valuable loot and equipment for your own faction.

Just be sure to not get caught stealing from a corpse from a still surviving faction or you will end up with a war with them.

Every survivor needs essentials to survive, this also equals into your faction needing necessities to run smoothly.

• You need a fireaxe to collect wood.
  
• A pickaxe to collect rocks for crafting and building.
  
• A cooking pot for cooking.
  
• Enough water bottles for every survivor.
  
• Weapons to defend yourself.
  
• Different clothes to survive the different seasons for all your survivors.
  
• A toolbox to construct more housings and defenses.
  
• Food to sustain your faction through winter.

Items that benefit your faction in general are maps, radios and skill books.
Maps are a passive tool that are active the moment one of your survivors carry one of them in their inventory.
The same applies to radios, but instead it will show wandering refugees and hordes on the map.
Skill books work on the same principle, adding skill points for each book. Stacking them enough will eventually max out your skills.

The most important one could be considered the farm books that increase your farming skills.
You only need to have a high farming skill when planting seeds or vegetables in your gardens.
Harvesting doesn't require any skill points, allowing you to use all your survivors to harvest an entire plantage at once.

The more survivors you possess the more food you need to produce overall.
The most basic idea is to stockpile enough food to survive through winter, generally having enough food for 30 days for your current amount of survivors at the end of fall should allow you to survive until early spring.

The best times to farm vegetables is at late spring until early fall. This should give you enough time to farm enough food to last you through a year even.

Food also takes up space, it is recommended to increase your max capacity gradually.

Rabbits are a good source of meat if you know how to hunt them.
Rabbit traps are the ideal way to have a steady supply of meat.

You can also consider stealing from enemy faction, essentialy killing them for all their valuables if you're desperate.

The easiest way to get food is also through cannibalism. But this can also affect your survivors negatively unless they possess a personality that doesn't concern themselves with morale.

Skinning a human doesn't require any skill points, allowing some desperate survivors to fight off starvation.

A good way to keep your faction happy is by farming chilli for spicy stew. You could easily supply yourself with enough chilli using only a small plantage.

This isn't common knowledge but the ammunition of npc factions have infinite ammo, in comparison your own faction including your own npc members only have finite ammo.

You can produce your own weapons and ammunition with a high construction skill and enough materials through mining.

There exists an option to 'unload' weapons for their ammunition, it is a good idea to unload every weapon you find and have it somewhere easily accessible in case you need to fend off an attack.

Walls are essential to keep your survivors away from harms.

Towers and the like are good ways to eliminate invading attackers as well.

A good way to protect yourself is having a two wall settlement. One outer wall for keeping out zombies and an inner wall to keep your survivors peaceful and ignorant of zombie attacks.

Raiders can use pipe bombs and molotovs to break down your walls, make sure to keep that in mind when your base is about to be raided.

A good tip would be to build nearby a friendly settlement. You can lure attackers towards their base, essentially forcing them to fight each other. This can lead to negative reputation so be mindful of that.

Boulders and rocks are a limited resource on your map you can mine for your own base.
You will eventually need your own mineshaft, you can use a map to look for minerals and construct your mineshaft on such places for a constant supply of iron and flint.

It might be profitable to have a separate base outside of your main base with the purpose of having a diverse supply of everything you need.

Wood on the other hand is reliant on forests. You can deforest an entire land of space and accidentally remove it from the map.

Forests are replenishable and new trees will grow overtime. Having a base just for collecting wood might be counterproductive but it can be viable if you're concerned with the safety of your own survivors.

While out collecting and scavenging you will face a lot of dangers from humans and zombies.
It is a good idea to have a team ready with armor and weapons prepped for protection.

Guns themselves use ammo which can be scarce and difficult to produce. It is a lot more economic if you equip all survivors with a bow and arrows.

Survivors run the danger of getting infected after prolonged fights. If they're out of stamina they are not capable to defend themselves if they do get caught. Make sure to not overexert your melee fighters over prolonged fights.

Raiding an enemy faction with a team might sound easy but there is also a chance you will expose your members to unecessary attacks if you do not know how to control your members.

Molotovs are cheap to make and can take out survivors in one hit, it works very well on attacking.

Pipebombs can destroy walls, allowing your team to invade with ease.

Armor and helmets protect against bullets but not against knockback.
Sharp weapons are useless against armor but still viable to target at their legs and making them unable to fight.
Blunt weapons ignore armor and can bash a fully armored enemy with ease.

I'm a bit overwhelmed with all the information regarding running a stable community.

I wanted to add a sections that explains cannibalism and bandits but do not really know how to convey it properly. I might add a guide that purely explains the strategies if you're a cannibalism tribe.