A good place to start is at local public libraries. Get your show together and approach the local childrens' librarians about performing a show for their "story hours." It's a freebie show, but you can pass out business cards and get lots of referrals locally. You'll get practice with real audiences and be able to try out new material that you'll later decide to put in your "professional" show if they go over well.
Also, during the summer, you can often perform at local recreational centers... again for free, but you're getting valuable experience instead of pay and you're getting noticed locally (and keep passing out those business cards!).
When you've done a number of these shows and feel you are good enough, ask the person in charge if you can take a photo of your performance for the local paper. Have someone take a photo of you performing (preferably with the kids all looking excited and raising their hands or something). Write up a story carefully (use spell check!) and submit it to the local paper. Summer is a slow news time for many local papers and I will bet you money that if you have a well written article and submit it with a photo very politely, you'll get some very valuable free publicity. You may even get the paper to send a reporter and photographer to your next show.
The moral of the story... don't spend all of your time learning magic and neglect to learn the business end of magic; how to publicize yourself, how to book yourself, and how to handle yourself publicly in a business-like manner. It's just as important as learning the latest magic trick.