If you want to get started working on a game right away, and want to have a working game within the first hour of work, come on down to the GSB lab! (GSB 2.130)
If you come on Monday or Wednesday from 7-10pm you'll actually be able to meet the developers and they can get you started on using GameSalad. There are a couple of EGaDS members there every night, so someone will always be there to give you a hand if you get stuck.