Want to setup small water purify plant.

Hello, am a agriculture graduate and i want to set up a small water purifier plant. I want to sale that water afterwards. Please guide me how to proced for that and also tell me what are Ultra Violate (UV), Ultra Filtration (UF), Reverse Osmosis (RO), Chemical Dosing based (CD) etc. I am reading mterial on this but a friendly guidance is more valuable.

My plant will be a small one, may be a capacity of 2 thousand lit a day..pl help.