You find them all around the map
no you must purchase Red Dead Redemption and I do not think it is available for the PC or Mac
Legally, no.
red dead redemption is multiplayer for ps3 and it is free
yes you can everything.
Yes, you can find the cheat codes on the bottom right corner of the newspapers.
no you can't
Yes and you get to improve on your profile.
Level 40.
red dead redemption.
I don't think Red Dead Revolver is, but Red Dead Redemption is.
Yes and you don't need red dead redemption to play
only if u have XboxLIVE