How to start the voice/non voice BPO

Hi, My name is Ashok. I am planning to start a BPO in Chennai(India),
I would like to know about the details like ,

•How much investment is required?
•How to Get the Projects?
•What are the legal factors involved?
•How much Manpower is required?
•What kind of staff is required?
•How much Returns are expected in the initial stage?

Any light on this issue is appreciated.