Hey nice start.
I would highly suggest looking through the forum here and checking others closet/computer case grow journals. This way you can see what worked and what didn't. Some simple main things would be that with CFL's you must keep the light very close to the plants 2-4 inches but closer to 2 and its also great if they can be height adjusted. This in turn normally makes heat an issue so you will need to devise a way to move air in and around those girls and then out of the case so the temp gets no hotter than 85 degrees and thats pretty hot. Get a thermometer if you don't have one.
Again good start just remember the farther you go into this with out your research first the harder the problem will be to fix if one is to arise. Small spaces do work though and I can attest to that ive got one growing atm and it looks great.
Research: CFL's , LST, Topping, Carbon Filters/cooling devices
Heres my girl to show what you can get in a small space and this is nothing compared to what some people can do on here.