At 15 years (sophmore right?) old you are old enough to start weight training. Remember that strength is the easiest to improve out of endurance, flexibility, coordination, and explosiveness. Do not forget to stretch. Often people forget to stretch before and after weight lifting. Stretch at least 10 min before and after lifting. It is always good to include a little cardio such as jumping rope before you start to lift--it will generally warm up your body and allow you to train harder.
I do not know if you are lifting for general strength or for a specfic sport, but hang cleans is a great excercise that builds explosiveness, strength and coordination. It is an excercise that will improve your overall athletic ability.
Good luck and remember if you want to gain muscle you must eat a balanced diet that includes breakfast--that most important meal of the day!
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