You can invite people to play the campaign with you over xbox live.
yes but it is really hard you have to go onto online then choose how many players you want that is how you do it
offline firefight coop surpports online 16 players, system link 16, and 4player split screen.
Both players will be Master Chief.
Yes it is two player on the same console and 4 if over xbox live
It will be, yes.
Yes.
yes you can
The second player will also play as Master Chief in a co-op game.
you can if you play coop campaign mode. The second player will be the arbiter
4 the coop is sik :D
There are many locations that someone can purchase Halo 4 from. Online it can be purchased from Amazon. In store, the game can be purchased from Best Buy or GameStop.
You can probably go to a costumes store or order them online.