It takes quite some time to learn how to grow (good) cannabis. I would go to a local bookstore such as Barnes & Noble or Borders and pick yourself up a growing guide. Yes these bookstores sell cannabis books. You can find them in the gardening section. Click on the link in my signature below to see what book I use. And by the way don't use fluros for growing. Go with a High Pressure Sodium or Metal Halide light because fluro's suck ass big time. I hope you know that building a proffesional closet garden is by no means cheap but if you sell some of what you grow then you'll make your money back easily. My closet garden is 8 feet tall and 3 feet wide and below is some of the equipment I use and what I paid for it.
400 watt High Pressure Sodium Light Kit with a Eye Hotilux HPS Bulb $150
Two Wall Mounted Fans $20
50 Feet Mylar (2mm Gauge) $20
Heavy Duty Light Timer $10
Electronic Pest Detterant (Optional) $10
180CFM Active Air Exhaust Fan $50
You have to remember this. The construction phase of your grow room is very important. If it is poorly designed then your plants will suffer greatly and all of your hard work will be in vain. A closet growers greatest problems are heat buildup and air circulation. If you don't have these issues under control before you start growing then chances are you will not be sucsessful. Here is a great site for buying the things you need. The layout is not the best but the prices cannot be beat.
www.mdhydro.com
Hope this was of help to you and good luck. For quality cannabis seeds I'll send you to
www.seedsdirect.to as the prices are excellent compared to the others and they give free seeds with every order. Considering they are in England the turnaround time in which you recieve your seeds is very fast. 7 to 9 days maximum.