Where do fans get to line up to meet celebs at TCA and how early do people start lining up?

My friend and I are going to the Teen Choice Awards for the first time from Arizona so we want to be able to have a chance to meet celebs! What time do fans begin to arrive??Also, where exaclty is the red carpet located? By the trams of Universal Studios? Please be as specific as possible, we are familiar with the park area.