I'll be straight up with you dude.
Save your money.
Put $50 in a jar whenever you can. And in 6 months or so you'll be able to get started. You need more than just lighting. You need ventilation, media, planters, pH equipment, scent removal, etc, etc.
Anticipate a good $300 up front. Another $200 a month after that. And probably another $100 to $200 before it is all said and done. If you break it up though, $20 here, $20 there, in time you'll have it worked out. Starting young means you can build a system over time, so spend your money wisely, do your homework, and just try to have a game plan for the next 2 years and where you'd like to be by then.
Maybe you get a couple $100 for Xmas/Hanukkah (not to discriminate) or you pick up an easy side job for some quick cash. Get yourself $800 to $1000 and then we can talk about EXACTLY what you need to do to be harvesting enough for the personal needs of say... 3 to 4 moderate to heavy users.
Otherwise...
Get yourself some 27w Daylight twisty CFL bulbs and some clamp light reflectors and a desk fan and hope you don't waste what little time, money, and energy you have.