So others have said, don't expect to do well at all in the 19 or 29 bracket. They will be filled with twinks. Even the 39 bracket will have plenty. The twinks will have about 5-10x your health and do double your damage. Not really good.

Personally, after I played 1 game at 19, I just waited til I was in the 50s bracket to try again. The higher the bracket the fewer the twinks.