I started on a skeet field with a 20ga Rem 1100, but was known to frequent the trap field with my goose hunting gun - a 3" mag 12ga Rem 870 30" fixed full choke loaded with #7 1/2 shot more than once. I would second the recommendations of finding a local club before getting into registered shoots...a lot of great folks that can give you lots of pointers - but pick out one of the "old heads" that you like, and listen to him. Both sports - skeet and trap - are loads of fun. I practiced for several years before doing registered shoots, finding the comeraderie of Sunday shoots with a bunch of guys (and gals) a lot of fun that also sharpened my target and hunting skills.
Welcome to the sport, and good luck!!