Job Interview

I applied for a job at the YMCA summer camp, and I recently heard back. I had to set up a time for an interview, which was quite scary! I have my first ever job interview next Tuesday immediately after school, and I am terrified. I am not exactly sure what to wear or what to say, and I saw that many many other people applied, so I have a lot of competition. I really want the job because I love children, and I want a full-time summer job to help me pay for college.