I too am growing some weed of my own, you should have about a cubic foot of dirt (potting soil) per plant you plan to grow. If you plan to use Miracle Grow, like I do, cut it down to somewhere between 6 and 8 cubic inches of soil per plant, if you use more than that you run the risk of burning the roots, then your plants are no good. Use a 75watt Florecent bulb, and keep it about 20 inches from the top of the plants, and just so you know the more light you give them the more females you get, but give them too much and it doesn't really have any possitive effect on them. Watter them with about 150ml of water every week, once the plants get above 3 or 4 inches in hight you can change to 150ml every 3 to 4 days, make sure you do not saturate the soil, you just want it damp, you don't want to drown the roots. And so you know about 16 hours of light a day seems to work best.