It’s best to start with absorbing as much information as possible about hydroponics. There are plenty of online articles, journals, studies, how to’s, over the internet, as well as publications, books, magazines, that can teach you the ABC’s of hydroponics from simple backyard projects all the way to intensive commercial implementations. It will be helpful if you could attend training seminars regarding hydroponics in your area, or merely visiting sites already operational. It’s basically providing some or all of the plants basic needs, which would differentiate the different forms of hydroponics one can implement. It is a great and worthwhile venture, with a great potential for a means of livelihood. I’ve been doing hydroponics both as a hobby and livelihood (i raise cardinal roses on an intensive aeroponics setup in california), and I’ll be glad to answer any queries. Best of Luck on your venture.