you need to buy the BF3 online pass and make an EA/Origin account. the online pass can be purchased from the store in BF3 menu. then select multiplayer in the menu.
Ya
You have to be 13 years old to play on the multiplayer for Battlefield 3.
Yes, the support man in battlefield 3 has unlimited ammo for him and all of his teammates.
Nope, it's only an expansion pack for multiplayer.
Yes.
Battlefield 3 does have Co-op mode, you can also unlock weapons for use in Multiplayer from playing Co-op.
you must be in the assault group. keep on playing multiplayer online and you will sometime unlock it through the assault kit.
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.
Uncharted 3 is a must have if you have a PS3. Popular multiplayer games are MW3 and Battlefield but none compares to UC3. But in my opinion battlefield is the worst out of these 3.
No.
Not if you've bought the game it gives you a code for it in the box.
Your character repeatedly swears in multiplayer and there is plenty of swearing in single player.