I'd start knocking out all the stories that I'e written over the years. There would be a few that would have to be updated to fit within the GTA World because as robust as the game is, it won't be able to accommodate everything on the page as it stands now. Obviously a couple of Sci-Fi heavy stories are off the table because they are unfilmable with the game. I think I'd be able to cheat my way through a couple of post-apocalypse stories I have if I shoot it out in the desert.