My friend is over but I can't figure out how to launch split screen. Only thing I can figure out is inviting ppl, and his profile is not Xbox Live Gold. Can he sign in guest or does splitscreen require gold?
I don't know if it's the same for you guys, but on the PS3, the "first" player just starts his account normally and then the rest of the players can just press the Guide button to start up their own characters.
This applies to splitscreeners playing with single players in multiplayer. The first person, who gets invited to an online game, joins normally. Then the rest of the guys just jump in.