I'm all self taught. You're really pathetic if you want to go into the navy and hack, I'm sorry, but where i've learned.
The best way if you ask me is to learn as many programming languages as you can, then you will know how to exploit them. Also get into a computer course at your school, and find out everything you can about how windows runs.
hackergames.net
http://www.hackthissite.org
those 2 should keep you busy, there are tons of links and stuff all over the internet, but watch your step, most are assholes, don't download anything either...
