Don't wear nv. It's a lie. Also, if you ever see any of us on or anytime you see only a few people on feel free to ask anyone for pointers. I'd be glad to show you a few my vent ninja ways if you ask.
Also, i agree with the DM server idea, use them for scouting or try playing without cross hairs to get a general idea of how your guns fire off and the general locations of your shots. Try to keep from spraying and fire in bursts of 3(ak,m4) and find a comfortable setting for your mouse sensitivity.
Oh, and herpes/aids always helps with a competitive edge.