Going to a sleepaway Soccer Camp?

So a week from today I'm going to a soccer camp at Baptist Bible College in PA (2+ hours away from my house) with 7 other kids from my High School soccer team (I play co-ed, but the camp does guys and girls separate). I know I'm going to need a TON of stuff (tshirts, soccer shorts, regular clothes, towel, bedding, etc.) but what would be an appropriate amount of luggage? So far I'm thinking a medium/small suitcase, a sport duffle bag and a backpack, plus my sleeping bag... should I downsize a little? Any tips for what to pack/bring? Anything else I should know? I've never been to soccer camp so ANYTHING will be helpful. :)