How many calories should i eat a day to burn my belly fat?

I am a 16 year old female trying to lose my belly fat. I am 5′ 2″ and weigh about 125-128 pounds. How many calories should i be eating a day and how many should i burn? I get on the treadmill for an hour 6 days a week. I think i burn about 600cal. Should running the treadmill be the best thing for losing my belly fat? If I could get some good information, that would be great.
-Thanks