LvLf420, My 1st indoor was a closet that I could spare, was enough space for 4 good plants, was all CFLs, puny buds but good vegatative growth, with your HPS you should do well. Look into descriptions of Sea of Green, I think this might be the way to maximize your yields. DWC hydro is probably the easiest way to go from the begining, just need an aquarium pump. (very stealthy). Keep reading, look into some of the threads here too, massive amount of information. Some good e-books are available as well of the subject too.