Just about any thread in this section with the words "closet grow" would give you some ideas. Your closet sounds about the same as mine; I use soil & up to 300W of CFL. (see http://boards.cannabis.com/closet-cabinet-growing/93029-tubgirls-not-tubgirl.html & http://boards.cannabis.com/closet-cabinet-growing/103289-wheelchair-project.html) If you have good ventilation, then you could put a small (150-250W) HPS in there instead. I've found ONE FAQ that deal specifically with closet growing: Closet Cannabis Growing Guide, and it's not all that helpfull.

I gathered most of my closet knowledge from reading the threads here (and other places) that deal with closet grows.