Orpheus suggestion on David Ginn and Sammy Smith is excellant. You can also get stuff from Steve Kissell. He has alittle booklet out concerning kid shows that is really good. They all also have ways of getting started and getting your name out there.
I got started in this about two years ago and on a part time basis (I am a Cincinnati Firefighter) I am earning about a $1,000.00 per month.
Go to as many conventions that you can get too. Even go to some of the Clown Conventions they have excellant classes concerning what you are looking for. You don't have to be a clown but they show you excellant ways to entertain kids. And they all have dealers from all over there where you can get magic.
I got a very small ad in the yellow pages and it has worked wonders. You don't need a big expensive ad just a small one. I hope this is helpful and best of luck. I think it is great you are getting into this so young I wish that I did.
You can also get your own web site real cheap, I have one and it only cost me about $70.00 a year. www.sluggosmagicgiggles.com
Best of luck,Sluggo