A Leveling Guide Brought To You By:

Build Kill Play Gamers

Alright, i'll try and get straight to the point. No stalling.
First open Killing Floor.
Click Solo.
Then Objective Mode.
Select KFO-Steamland.
Difficulty, i recommend Normal. If you are already level 5 try using hard.

Click Play.
Do whatever you do before playing (Bathroom, Eat, Ect.).
Select the Medic Perk.
Then click ready.

Lockheart himself will help you through this part of the game. Pretty much just follow the objectives and do whatever he says but ill guide you through anyway.
He will ask you to kill some Specimen. Most likely just 14 or so.
Kill them and get to the trader.
Do not refill ammo or gernades (if on Hard).
Buy a M5M. Then repair your armor.

Alright if you did everything correctly you have a MP5M with armor. Mr. Lockheart will ask you to open the gate. Well, he destroyed the breakers. So you must press 5 to get the Welder tool out.
Now then you must repair the breaker while Specimen try and destroy the breakers.

As you can imagine this gets very annoying.
so just repair about three or four of the breakers.
And get to a spot you can watch all of the ones you repaired.
Also wait for the gate to open.
Get to the trader and repair your armor (nothing else to do at the moment).

Alright, were almost there. You should still just have a MP5M and 100% armor.
This time Mr. Lockheart shows himself to you, but hes hurt and hes also bleeding out.

So you will need to use the MP5M and shoot him with healing (press down [click] on the scroll wheel on the mouse) while you are killing the Specimen off of him.
Pretty easy.
He will also get tired and have to rest every now and then.
Just heal and throw a gernade on him (when surrounded).
When you get to the destination, the trader will become available.
Buy the Schneidzekk, reapir armor, and refill ammo. Then wait the timer out and get ready for the most important part.

By this time you should have your loadout.

Keeping up has to be the hardest part of this guide. He will lose heath faster than you can heal.
However lets get to bussiness.
When this wave starts you will want to kill and the Clots, Sirens, Bloats, Crawlers, and Husks.
You will want to destroy Husks as fast as they can spawn (they will shoot Mr. Lockheart and kill everything that is attacking him).
Of course, if nothing is attacking Mr. Lockheart let the Husks and Bloats attack him.
Now then if you are lucky, a fleshpound will appear and you do not want to kill him.
Let everything attack Mr. Lockheart (Just be sure to swap between the Schneidzekk and MP5M to heal him).
Then the time limit will run out.
It will ask you to kill the remaining enemies. DO NOT kill them.
Just sit there and heal him until your little heart gives out.
Like so.

Thus he keeps getting hurt by the Specimen, and you keep healing him with your awesomeness.
Level 0 to Level 4 will sweep by like nothing.
Level 5 is when it takes some time to level up. Best of luck!

I sat there with 1 clot, 1 gorefast, 3 crawlers, 2 stalkers and 1 bloat on Mr. Lockheart.
It was hard work to keep up on healing, but i timed myself.
Before i started healing i was at 69k healing.

10 minutes had past and i did nothing but heal.
By that time i was at 80k healing.

1,000 healing per minute!!
If it takes 100k healing to get to level 6, and you get a little over 1k per minute.
In 1 HOUR 40 MINUTES. thats all it takes to reach a level 6 medic.

This Guide is not fully complete. I will add screen shots and possibly videos later.