www.paintballmanager.comIf you have played manager games previously then you are gonna like this game.
You get your team immediatly after signing up, so you can get started right away!
You can create your own tactics, watch the game live (2d!), train and sell your players.
The game is relatively new (first season started september 2008), so you have almost equal chances to become super bad ass team!
The help page is really useful as it has sections "first week" and "second week". Following them avoids confusion, what you might get from seeing all those confusing buttons. After 2 weeks you should know quite alot of the game.
Any questions, ask here. Also, if you do decide to create a team, write it here :p.
Have fun.