The simplest way to grow in your bedroom and not have to deal with a lot of BS is to invest about $250 into a grow tent. The Homebox XL is a GREAT product; there's a couple threads about it in here, and the user dusto2k3 is running one, if you can find his logs.
For about $1000 you can get the tent, a NICE light or a couple average ones, a reflector, an extraction fan, and even a carbon scrubber. The footprint is 4x4 and has 6 feet of headroom.
If you don't have a full room or closet to dedicate to a grow, this is the way to do it.
Good luck