Where to start? If you've never built a budget before, you may think it is too scary to start now...but it's not! Actually, it's pretty easy and it's the first step toward making sure you have the money you need when you need it to do what you want when you want to!
Check out this website for FIVE easy steps to budgeting while you're in college:
http://moneyfor20s.about.com/od/makethemostofyourmoney/tp/collegemoney.htm
Disclaimer: Nothing in this site should be considered authoritative financial advice. Your circumstances are unique and you may want to consult a financial advisor.