The audition process was simple - they get you to do a simple scene (mine was asking a girl out to the prom). Then they call you back if they liked you. And we were just called back to a final audition where they get you to do another simple scene - I can't remember what it was now. And Doug asked me to do some kung fu moves.
But leading up to that I'd done 3 years of drama school and many other years of acting classes. So my advice is learn how to act from as many sources as you can. Get a good agent and then try to get an audition. Having said that - I think a lot of luck goes into getting any role - they see over 2000 applicants every year - for 6 roles. So sometimes they'll just miss some great talent I'm sure.
But keep trying!