It's quite simple really. All you have to do is make sure you have an internet connection and just create an online account on Battlefield 2.
Yes.
yes
You don't man!
You have to be 13 years old to play on the multiplayer for Battlefield 3.
No
Yes, Battlefield 1942 has a Multiplayer when you start the game and pick your player you should be able to click the "Multiplayer" button next to the Singleplayer button.
No its completely on line exept the tutorial.
No there is CO-OP but its multiplayer style there is no 2 player in this game.
No.
No it does not. All of its multiplayer capibilities are online only.
Battlefield 3 does have Co-op mode, you can also unlock weapons for use in Multiplayer from playing Co-op.
Depends what you mean. There is a campaign mode and a Multiplayer so no its not?