If you're interested in some serious guidelines for your nutrition experiments, I would strongly recommend reading some of the articles by Dr. John Berardi. You can find them in the "Diet Programs" section of the site over on the left.
For someone of your level of activity and age, start with the 7 Habits... article. After that, read the Massive Eating and Massive Eating Reloaded. It'll give you a solid framework from which to plan your nutrition both in terms of what you should be eating and how much.
Although I don't like to give explicit advice, if you're young, active, and healthy, stay away from creatine. Spend the money on a quality protein powder and use it, especially post-workout. You'll see phenomenal results if you are strict about following a quality nutrition plan and get on a good, solid workout plan (more on that in a moment).
For someone of your age (hell, for any of us who work hard and work out hard), you very well might not be getting enough sleep. I know it can be tough to end your night early if you have plans with friends/girlfriend or homework, but aim for as much sleep as possible: 9 hours if you can. Supplement your sleep with naps. I'm on a school schedule (I'm a teacher but am young and have a social life) and naps are key to my continued progress in the gym.
Workout plans: people on this board will argue endlessly about full-body vs. split training, but you can't go wrong with any of the programs in the "Training" section. Read as many articles as you can, but don't start making up your own programs 'til you've been at this a while. Pick a program (maybe someone can suggest something suitable for him?) that sounds doable for you, stick with it, eat well, sleep a lot, and you'll grow and get stronger.
Work your core lifts (squat, deadlift, bench press) and the variations and other movements that support them. Stay flexible, don't try for heroic weights in the gym (steady incremental progress is better), and pay very close attention to form. The last thing you want is to get injured.
Lastly: before you start to do any of this, do as the other posters have said and take some goddamn time off. Sleep alot, clean your room, hang out with your friends, and rest up while reading up and planning your spring/summer workout and nutrition plan.