How long will it take me to lose weight?

I'm 15 years old, 6' 1", 220 pounds. If I go on a diet, drink tons of water, eat 5 or 6 small nutritious meals daily and take vitamin supplements, Plus jog for about 20 minutes a day, and do weight training 4 days a week, How long will it take me to lose weight? I'm not sure exactly how much weight I want to lose, I just want to get slim and look good. Thanks :-)