You can play cooperative missions but you need 2 seperate consoles, you cannot use split-screen
No, you mnust be online in order to play Red Dead Redemption multiplayer.
you need red dead redemption to play outlaws to the end
No you don't have to if you do not want too.
no only online
No :)
two people can not play together on the same console on Red Dead Redemption.
you can play LAN just go onto the online menu and there is a choice for it.
Yes you can play them on most game types but they will not be able to play undead overrun with you unless they have the undead nightmare game/dlc as well.
You cant.
One of the best online games is probably Red Dead Redemption and Call Of Duty
yes can but one of you has to be the zombie.
apart from the language and the people you play online mode with, no there isn't