[@Ryougu] As many as you want, according to your class. Just know that the more skills you take, the less effective each will be.

Also, if you come up with new skills, you can include those, too, with descriptions. I'll check over everything, and provide the official designation on your weapons and armor. 

Oh, and your armor is essentially extra-vehicular powered armor. Feel free to add mounted weapons, jump jets, etc. Anything you can think of. I'll review it all impartially.