I need to echo George's suggestion. Go fly Sportsman with a good low wing plane, heck an Ugly Stik will do the sequence, and then if you do like Pattern save some coin and get a pattern plane down the road.

The most important thing is PRACTICE. My first year I flew an Excelleron 90 and one of the guys I flew against had a Tracer 40. You don't need big or even a "Pattern" plane to get started.