The DB and the 55AX should do well for learning the entry-level pattern maneuvers. I'm sure that you will enjoy it. If you ever feel the need for more power, remember that you can pull the inner cone from the stock 55AX muffler and gain almost 500 rpm. You will be amazed at what a Master Airscrew 3-blade 11x7 will do on that engine. It is like lighting an afterburner. Those are two simple techniques that do not require airframe mods or rebalancing. A Jett muffler will provide even more of a boost. Good luck with your DB.
Jeff