There's no co-op in the Single Player Campaign but there is co-op in Specials Ops.
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No, but there are individual co-op missions.
Go to "Special Ops" in your menu, rather than campaign or multiplayer, select 2 players then choose a mission. It's not a story based co-op, unfortunately.
In my opinion, the best co-op game for PS3 is Call of Duty Modern Warfare 3, however if you are too young to play Call of Duty i would recommend Lego Batman 2.
Saddly you can't. The creators of cod5 waw(which does have co-op campaign) and cod6 mw2 are different.
make your friend go to download play, 3DS, and then you guys can play CO-OP