You also need a healthy diet! Remember to have atleast 5 meals a day which include breakfast, snack, lunch, snack, then dinner! However it is way more healthy to have small, yet healthy snacks during the day and not set meals.
I think that the best way to excersize is to jump rope. If you jump rope for 15 minutes you will lose 200 calories. So I think you should jump rope for 45 minutes a day. (15 minutes BEFORE breakfast, 15 minutes BEFORE lunch and 15 minutes BEFORE dinner!)
If you jump rope for 15 minutes, Its just like running a mile! So grab those ropes and get ready.... Get set..... GO!!!