ORIGINAL: MTK
Hmmm...I don't mean to be mean or a party pooper but, why are you asking questions about Pattern Competition in a Beginner Forum? Let me suggest you ask in the Pattern Forum. You will get all the right advice you need to make the most informed decisions.
In Pattern's entry class, Sportsman, you can fly whatever you are flying now, even if it's a high wing trainer type that has ailerons. If you can loop it and roll it and climb straight up into a stall, you're golden
+1.
For starting out, fly what you have. I flew my first contest with a small low wing sports model with a OS 32sx.