If I were you, I would wait before buying anything. Save your money, and once you actually have some experience playing on the field, then start spending. The experience you garner from the first time you play will act as a guide to assist you in making intelligent purchases. The same can be true for any purchase you make, really.
You're excited about it, great. I was excited too when I found it three years ago and was only fifteen. I don't think it would've made a difference had I purchase a bunch of equipment four years ago and steeled myself in preparation for my first game as opposed to going there in some civvies and renting some equipment, which is what I did (thanks again to SIR).
Just advice from a newbie who had a similar sort of situation going on.