1:Beat the skirmish game atleast 12 times and learn the controls and vice commands.
2:Be nice to other people don't get into some one's tank unless he lets espcially if he is repairing it or hes the host and you tick him off.
3:Go to forums and read up on Tactics and Strategies,(if there are any).
4:Atleast play throught the 5th mission in sp so you get better.
5 on't go on the web and flame people who are talking about something you don't know about.
^th and final:Always and I mean always listen to the host's rules,notices,andclan tryouts,cause if you get on a game and i'm the host and treat me like a ragmop I will beat you down then ban you from my game before your last building goes.

I hope this helps the bad (mean) noob's.