I'll add a few links for the tech side so that you and your friends can be ready no matter your age, you should keep the second link in mind to practice with and the first one is just nice to have to start with fwiw.
Good luck
http://www.youtube.com/watch?v=Kwshg8mRSuQ
http://www.youtube.com/watch?v=Ptz_ybNRavg
Also keep in mind there are some cool cheap lenses for iPhones to add. This is all for playing around and nothing serious but it can help create a story board if you don't have an artist, can't draw or sketch or are alone so take it for what it's all worth… low budget, no money and using what you have. You can make some cool stuff but if your story just sucks it's all for nothing.
There have been some great ideas for you here, now it's up to you to do the rest and have fun
PS, when I was your age I worked for a landscape company, made cash and bought art supplies with said money. There is always a way that is safe and healthy to get what you need and to build up fun stuff with a bit of effort, plus it gave me ideas for design which ended up in my favor, the owner liked my designs for landscape, he had me draw plans up so we both made more money and this added to my real creativity, not just cutting grass