Start looking at the bows that have a longer axel to axel. More stable. dont look for speed in a bow. You want forgiveness and accuracy. Especially first starting. Dont buy a bow cause someone tells you its the best or awesome. More often than not, the shooter makes the bow. Shoot for yourself. Then make a descision. I've seen to many people spend a ton of money. and later after getting feel of the bow. They hated it. The big (2) 3D competitions ASA & IBO. which ASA you are limited on speed by which class you shoot. While IBO its arrow grns. The biggest thing you'll find is that judging yardage is the hole secret. I had Jeff Hopkins give me some real good ideas for yardage judging that I'll share if interested. Helped me a ton last year at the ASA pro/ams.
good luck and practice.......