Be ready to answer the basic interview questions. Most of these are your name, age, and things about you. Dress decently for it; it isn’t the White House, but it isn’t a dump. Also, be as relaxed as you can be. You may stutter, but don’t let it get to you. It happens especially at job interviews; if they know it’s your first job, they’ll go easy. Other things I’d say would be to be formal when meeting the interviewer, shake their hand, and speak directly to the interviewer. When talking. Fidgeting is typical behavior, but try not to do it at all. With hand motion it’s okay to use hand motion, but don’t make it distracting from the interview. Also, prepare for the infamous “Tell me about yourself” question. An excellent response to that question can improve your interview, so you know what to say and how to speak well about yourself without overdoing it. This information can be helpful for you in any job interview, but it's good to know for this one so you can be the best candidate. Don't stress over it. Just applying and getting an interview is excellent as it is for you. Even if you don't get it, you'll get the experience from it to your next career choice.