Hello Anu,
To start with you need to have a land. Then capital to start cultivation. Once u have a land. Get the soil and water analysed. get a bore dug in the field for source of water. Then based on the soil analysis results, location of the land a crop suitable to that area can be taken up.If you plan to erect a greenhouse u can go in for any crop. Check the proximity to the nearest Market. Then if you have to send it to a distant market u need a cold storage vehicle.
Regards
Ashwini S