Just got my very first part-time job?

That shouldn't be a problem! You should be entitled to some holidays anyway. If you tell them far enough in advance so they can make the rota I don't see how it would be a problem. If you have any questions about your hours or anything like that, just ask them. I know how you feel I remember my first job, I didnt have a clue about anything, but honestly it will be fine, it's not as bad as you think! Most managers / bosses are actually really nice and helpful! And if you ask about going to camp, the worst they can say is no (but I honestly don't think they would)!