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first of all, exercise at least 3 days a week for at least 30 minutes. switch off between cardio (running, jogging, swimming laps, for example) and weight training.

to make it short, follow the food pyramid. go to mypyramid.gov

and put in your information and it'll give you exact numbers as far as suggested daily calorie intake, etc.

I would say definitely start with a good breakfast. Eat a healthy salad or sandwich for dinner and a reasonable dinner with plenty of protein and vegetables but not too many carbs. Also, if you're in college don't drink too much beer! I did and it will definitely show up in your stomach after drinking too much.

I've included a link from a blog that has some really good advice–check it out!