First off, don't just grow one plant at first unless you know it's a female. Start 4 and keep the strongest female to bud if you only want one plant. Personally, I'd try to get a cutting from your friend and that would save you some trouble. Also, get a better light. Sounds like you could use a 100watt-250watt High Pressure Sodium light, but if you can't afford it, at the very least get a full spectrum compact fluorescent. Next, PH is very important so be sure to use neutral soil, not just dirt from your back yard. Fans and ventilation are very important so do the best you can with that. As far as light cycle, I start mine with a 24 hour cycle for 2-3 weeks, than 18 on/ 6 off until you want to flower, than 12/12 until they're ready. Good luck and keep us posted. Oh yeah, I highly recommend you check out the Widow Makers grow guide, that is a really helpful tool.