Are you planning to grow in the computer or the whole cabinet? If your going to do the cabinet(more space). Remove that shelf/shelf hardware.

You can grow(veg/flower) two plants at a time in that small of space in about a 2-3gallon pot.


..Paint it flat white inside, start with 4/100-150 watt cfls.
..Get a light timer
..Get a thermometer w/humidity gauge put it at level with the base of the pot. ..Get some ventilation in there, small computer fans work well with a little wiring if you can, or discover a solution.
..You may run into a smell down the road, which a simple duct work with PVC and a carbon filter can take care of. Couple air fresheners could help keep the smell of dirty laundry down a bit.
...If you can afford more that this invest in lighting, but with that hps gives off more heat so you will want to accommodate you cabinet, I.E. better ventilation.

-Get some bag seed/ or if you can loose a 100 bones :Feminized seed from your local on-line site.

Best of luck.