First I will give a walkthrough of creating a basic scenario
Look at the bottom of edit selected events menue
First we have months, this means the minuinum number of months that must pass before an event trigger is allowed. Second we have delay, which is amount of time after all triggers are meet an event will transpire, however delay will not affect an event if triggerd after the minuinum number of months
Now will create are first scenario. You must have a map with one castle set to the player.
Go into the edit selected events menue cick on the trigger No Gong In Your Estate then the action Win set the month 3 and delay 5
Next we want to enter the map editor and add a flag to are map, for this example set the flag to green 1
Next go back into the edit selected events menue, Click on the trigger Always and event Gong Infestation set the amount of gong 3, flag green, and flag number 1
Then we want another trigger Always and event Gong Infestation Amount 40, flag green, ,flag number 1 but this time change
Now your mission should look like this months,
when we start playing the mission 3 gong will spawn. If the gong farmer cleans it before 5 months we win even thought more gong spawns because are victory was only delayed

Using missions can help organize your map into multiple parts
The first mission could be Building Site Complete trigger for event Win
we can use trigger Always and Give Lord Full Peasants to speed up the first mission
The first mission may have a prohibition on some buildings .Then the mission after could have all buildings allowed
Missions can have different starting resources
We can turn off an AI Always Trigger Control Lord's AI event
so we can tack control of their castle in the next mission Event Take Enemy's Castle
For the next mission we can have a reinforcing army by placing a flag in front of the new castle
and are second mission goal can be defeating multiple Invasions
With a repeating count of 2 extra Invasion with 7 months in between

If you want to use boats you must first place a series of flags
one red flag at the oceans edge and another red flag by the coast. Then 4 blue flags, the first by the ocean edge,second near the coast than 2 heading back to the sea.
Then set up the firsts boat by choosing Always as the trigger. Than event Boat Move Set the first flag red 1, second red 2. After that make sure you have Trade Ship and Turn To Wreck. Trade ships are the only type of ship that can become a wreck.
Now for the second boat Always as the trigger, event Boat Move. set the flags blue 1, blue 2, blue three, blue 4. Additionly the number next to the flag number is the months of delay. Have flag 1 and flag 2 delay for one month.
Have Viking Ship and Leave Map
Next we will create 1 yellow flags one near the blue flag 2, the other inland
Next we will create a naval Invasion first set the months 3, Always as the trigger, event Invasion For this Invasion set the number of axe throwers 5, catapults 2,and ballista 2. Now invasion point (where the army will spawn) set to yellow 1. You can have either a target point(where the army will move to but the AI can build its camp away from it)
Have the repeat counter and timer off
set to Siege point(the army will build a siege camp near the flag) and flag yellow 2
We also have the option Lord ( a lord will spawn with the army) or No Lord (no lord spawns)
Theres the option for Normal(alerted when the army spawns) , early warning(the military advisor will warn months before the army arrives), or full(both warnings )
Set the army to Olaf and Attack Player Player
the delay will cause the Trading ship to be in front of the Viking Ship
Also if you have early warning the military advisor warns you(Woodsmen have seen a band of enemy solider heading this way)
Troops should spawn on the coast near the ship and the Trading Ship should crash
The Viking Ship should sail away
Invasion spawn a siege camp,2 catapults,and 2 ballista

Invasion are one of the most important parts of Mission making
Lets go over are options when making an Invasion

• You can have any combination of troops you like
  
• invasion point ( where the army will spawn)
  
• Target point(where the army will move to but the AI can build its camp away from it) They are not required but let you fine tune the direction of the AI
  
• Siege point(the army will build a siege camp near the flag)
  
• The repeat counter can be off, 1-10, or infinity
  
• Repeat timer allows you to space out repeated attacks by a separation of months
  
• We also have the option Lord ( a lord will spawn with the army) or No Lord (no lord spawns)
  their can only be one lord per AI at a time
  
• Warning options Normal(alerted when the army spawns)
  early warning(the military advisor will warn months before the army arrives),
  or full(both warnings )
  
• It they can leave the map or stay permanently
  
• Army mission siege(they build a siege camp)
  attacking(they do not get a siege camp)
  defending(Guard an area)
  movement (use as a patrol you have to avoid)
  
• Who they are loyal to
  
• if they reinforce(give units to a lord)
  Or attack( the lords you set) can be turn off if you wan them to stay in one area

You may want to set the allies. You can have any combination with The King, Sire William, Lady Seren, Sir Grey, Edwin,The Hawk The Bull, Lord Barclay, and Olaf
You can have a more creative Invasion if you set the Invasion point to a flag on an island, All the troops would have to be pitch boat warriors but you could still have siege equipment if the siege camp was created in a good location
You can create a defensive army to block a location
By placing a flag in between am attacking force and a castle you could make a battle were ever you want
Remember that a attacking army can not make siege units even if you give them siege equipment. (they can still have laddermen but without a siege camp they cannot replace thier ladders