I've been busy hadn't done much lately since Bruce Lee and Snake Plissken but I have been working on The Expendables movie cast just waiting on my parts from Slayer Designs to arrive in the mail
YOu get orders sent to you in a PM, there are instructions in it. When you go to the game to make your post, depending on what your job is... it could be medic so I will give an example of medic..
G.I.Joe Medic
Heal GungHo +2
If you are a soldier
G.I.Joe Soldier
Hurt Alley Viper-2
as you get more experiance you gain levels as well as vpoints toward your damages or heals.
G.I.Joe Covert ops level 1
Hurt B.A.T. -3
Stuff like that..
But again job classes change and not always the same. So it stays interesting. hope this helps!