This is the NAB code of conduct. You should try to follow it as closly as you can. It will make everybodies game experience more fun.
Do not be abusive.
Do not swear, unless everybody on the server is ok with it.
Do not shoot people while they are typing. If you see somebody standing there, they might be typing (although you could just stand behind them until they moved...).
Do not trash talk in a abusive manner.
Do not camp. (Yes, it is possible to camp in this game. Dont find a spawn point and wait. You will probably die if you do that.)
Try not to talk about random things. Keep the chat to stuff about NAB, or at least the same genre.
Don't form alliences with out consenting the other people in the server.
Do not tell people to press buttons that will make them quit the game or turn off their computer.