installing mining rig needs some amount of technical knowledge. of course any layman can install those equipment's but main task is to maintain the system.

most of Indian cities are good for cheap electricity use. ROI is crossing more then year in current phase, so a long term estimation must be there.
I suggest you to contact BHANU SHAKIA. you can find him easily in youtube. he has built largest mining farm in india. and is very helpful in this process.