Go to www.tenniswarehouse.com
and read everything on that website. Then go to their messageboards and read the racquet discussions there. Then demo as much as you can get your hands on and discuss possible racquets with your coach. I agree that your first racquet should be an inexpensive one, until you figure out what type of game you have, which weaknesses you need to help out and which strengths you can exploit with your racquet. You can buy a better one in about 6 months.
Or, you could just buy a Prince Triple Threat Warrior. A good solid racquet, and since it's an old model you can get them for about $80.