I would agree with the person above me in terms of
nutrition and all that. I do the Core plan in Weight Watchers and the way that works is that there is a list of foods that you can eat and foods you can't. You eat three meals a day until you are satisfied and snack on fruit and veg. That way you're never starving and you don't have to wait hours and hours between meals (which can mess up your metabolism).
I don't know if that system will work for you (it doesn't suit some people), but for someone who isn't used to counting everything up it's very user friendly and less time consuming. Having said that you would almost certainly need to bring your own lunch to school. If you are interested I'm sure you could get the information from somewhere rather than joining up if you don't want to pay for the meetings.
I would probably recommend giving up all sodas, even if they are
diet, but I would highly recommend that you start eating breakfast. I never used to, but since I have started my
weight loss I have found that it is one of the things that has helped the most. Also be careful with the bread if you eat a lot of subs and that.
The important thing to remember, as a lot of people around here say, is that the idea is to lose weight as a result of living a healthier life. That means not following a restrictive
diet that you'll never be able to keep up but to eat healthy as often as possible while allowing yourself the things you like in moderation and when you do slip to get right back on the wagon on the next meal rather than abandoning it altogether.
One final thing, glad somebody around here has mentioned the drums as a form of exercise! I started drumming about nine months ago and once you get into it it can be very fun exercise! Don't know about Rockband, not a big gamer, but I've heard the drums part of it is more realistic than Guitar Hero.
Best of luck with the
weight loss. If you follow any of my advice it should be this: Eat breakfast, Eat healthy, Enjoy eating, and beat the sh1t out of those drums!