If it was a PPV or a TV show, I'd tell you to get there around 11 AM, but since its a house show, get there about 2 hours before the show starts because that's when the Superstars normally come. You might even be lucky and some of them might stop and sign stuff, but it will suck ass to take pictures right then and there because usually there's a fucking fence in the way.
Unless you want to get pointed by the wrestler the sign is about, its always cool to experience!