You'll also be in need of headsets. Expensive $250-300 headsets like ASTROS are best. These will give you the ability to "sound whore" and be fully engaged in the game.
Okay once you have conquered skill and the proper equipment, you can participate in competitive tournaments. You'll need to learn set ups and call outs to be able to be an effective player/team.
I simply do this for fun, I have a friend, Irwin, who has been my doubles partner for 2v2 matches for years now (5 CODs straight) and we've done some pretty coo stuff.