I'll second Infernowolf36's statement. Except to add Best person to ask is the dude who owns the place and he's always their. Hell set ya straight. Good man.
If you just want to start/try, I'd suggest going to play and rent a gun. If you're looking for a good starter gun, I'd recommend the Valken TRG for a starter gun. I upgraded to a Valken MKiii and it's been also been awesome. It really depends on your budget and how hardcore/casual you want to play! If you call OPFOR or better yet, stop in for a visit. You will get all the answers and more! I love OPFOR and the owner is a great dude who's very helpful.
Thanks! Your answer is awaiting moderation.