
Imperial Guard
You're the Lord Commander Militant. Before the main force arrives, you must
Guard players start off leading a 20 man Conscript Squad. Once your time as a Conscript is done, you may lead an Infantry Squad or Tempestus Scion Team. If the enemy has deployed more points, you have access to anything Astra Militarum as long as it will balance the Deployed Points. Use the models you own, don't buy models you don't have just to make this work. Some leaders are tasked with Infantry or Tempestus Scions right off the bat.
Your Character model gets 1 extra melee attack and wound
150 xp to unlock a permanent ability or next model, then purchase the next model with its worth in points with your xp. Any unlocked ability can be used on your character from there on.

Veterans
55 Points
Sergeant
If you survive being in Infantry or Tempestus Scion, you may join the ranks of the Veterans. Your Character's BS and WS are 3+