Like others have said, A JOCK!!!
If you can get your hands on a set of coverall's wear them, it's not like you need camo at an indoor place.
Bring more $ then you think as you my find yourself trigger happy. Also, never use a paintball that has been on the floor. The sand will cause a huge problem with paintballs blowing up in the barrel.
After you get hit for the first time the rest just don't seem to hurt as much either.