yeah bro you'll be cool if you dont use that room when 12/12 starts. and if any windows cover them with something so no light will leak through it. try to find your self a wooden box of some kind. yeah i know its easier said than done. ya gotta start somewhere tho. starting 3 more seeds would be a good idea to make sure you come off with at least one fem. and a couple more of the lights that you have now would be a good idea. if you try to grow with that light you might not be too happy with the yield. warm white light will help your yeild alot. if you plan on flowering out of the container its in, i wouldnt let it veg to long, or if you do let it veg transplant it at least a couple days before you change the light cycle to 12/12. but any light that hits your plants while lights are off will promote hermi's. hermi's suck ive had a couple, not because of light leaks but because of genetics, not bag seed either. its hard to get started. hell i had to dish out over 2000 bucks just to get started correctly. but now i do have a really nice enviorment for my ladies. it took me along time just to get setup nicely. but start with what ya got and try to make it work. nothings impossible, hard to accomplish but not impossible. best wishes to ya bro.