You may want to find a good general book on marijuana cultivation, like
Grow Great Marijuana.
I say that because you are asking some very fundamental questions, and you could probably benefit from a broad overview.
After getting some basics from a more general source, start trolling the forums like this and reading through threads that catch your attention.
There's an awful lot of information out there to take in, and many times - like should you use a fluorescent or metal halide HID, soil or coco or hydro, etc - are simply choices you must make with different trade offs.