The best things to do is read stuff on the internet and buy a book-
http://www.amazon.com/exec/obidos/tg...=UTF8&v=glance

Getting equipment is easy, there's nothing ilegal about horticultural lights or hydroponic equipment. If there's a hydro store near you get the equipment from there, and pay in cash if you're worried about suspicion.
It doesn't have to be expensive. In my setup the most expensive thing was the 250w HPS lamp which cost £125, the whole setup cost about £350 but that's because I built the cupboards from scratch so I had to buy all the wood. A walk-in closet would be a perfect place for your garden.
You can't say how much one plant will yield. It depends on the strain, genetics and growing conditions. A pound of bud is a lot for a first grow, aim a little lower until you know what you're doing. My setup is 3 feet x 2 feet and 5 feet high, it only supplies me with about 3 ounces but that's plenty for me.
Keep posting questions and stuff, the people on here will be happy to help you as much as possible to get your ganja garden up and running- good luck!