tis a shame you appear not to be in Enland. I got a decent hook up for second hand equipment. 600W balast UK£20, 10" acustic fans £40, carbon filters £35, truncheons £15, standard dimple shades £7, 600W HPS £3 etc. nothing is guaranteed but the supplier will replace things that don't work. but all electrical items need re-wiring, which can be daunting for non technical heads.

Got any pics of your potential space? I'm sure some peeps would have their imagination run overtime with ideas if we could see the room layout and door and window positions.

I would:
get a length of timber cut the exact width of the room and install it
suspend 1 * 600W hps or
2 * 400W hps (or 1 hps + 1 mh) from the timber (increase your watts if you can increase air flow),
paint the room matt white
I'd put a squirrel cage blower (not centrifugal type) over head for extraction (into loft space or outdoors but any area besides where the vents draw air in from),
louvered grills in the lower quarter of the door for constant air in,
4-6 15L pots or as many as you can fit in with a foot to a foot +1/2 to be able to space them a little when they are big,
wall mounted oscillating fan or two,
plastic sheeting over the floor and around a foot up the walls from the floor.

You would probly require some items like timers, a contactor, maybe extension 4-way lead, hygro-meter, soil moisture meters (useful I find especially with varying strains in the grow room), carbon filter (optional), and anything else to help you on your way... Is that at all helpful? I feel I blabbed on a bit!
SpiritLevel Reviewed by SpiritLevel on . New Grow Space What's up people: 3 wks frm harvest and somebody robs me!!!!! I am moving my thing indoors ASAP! Would some one give me some good beginner specs for a closet grow. The room is a 4'x5' space with a single over head bulb for a light right now. I got about 400 bucks. Help a guy out. Rating: 5