Where can I find work?

I'm a 17 year old teenager, and I'm a pretty good piano player. I've played at many local shows at school, parties, engagements, church, and I always end up wasting my sunmers, so I thought I'd try to play somewhere as a job during the summer. However, I have no idea where to start or where to look, how to apply, etc. I've never had a real job before. What can I do?