Lady Squee said
The rules and everything would be there.Just not the "Welcome to Westeros. You find yourself among the mourners after the passing of King Robert. Blahblahblahblah".
If it's based on the show, you could simply say "Takes place immediately after the events of Season 1, Episode 7." If you've watched it, you'll know. If you haven't, well, then you're probably just there for the doubt shenanigans anyway.