http://www.nowloss.com/ is a very good website with lots of convenient but effective exercises and dieting tips.
A low-carb diet will help burn and lose fat. There are different types of low-carb diets out there but typically, you shouldn t exceed 100 grams of carbs per day. Coupled with this, you should exercise. Since you stated you don t have too much time on your hands, I d recommend High Intensity Interval Training (HIIT). This is a way to lose fat without losing muscle and all in 15-30 minutes a day.For example, if you like to run, you can jog for 5 minutes and then sprint for 2, the jog for another 3, then sprint for 2 etc. It looks easy, but believe me, it wears you out! Good luck!
Try to hit up the school track and run 30 minutes a day. Or run around the community. As for dieting, pretty much just cut out bad sugars. Stay away from processed foods like cheetos and fritos. Also, make a goal for yourself to do X amount of push ups and sit ups before bed. You start off with a few, and in a few weeks, you will notice a big difference.
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