Are you aware India is in the stage of getting stricter with this cypto currencies and might even ban in India. Have you read all the statements release till now and nothing positive as such have come out yet form the statements release by the officials. Banks are freezing the accounts of exchanges and on this you have come up with your exchange and for me this would be the wrong time . Had government given green signal it would have being worth it but now I think you are playing highly with risk.
Still, it's not finalized in India. We are aware of the Indian government guideline.And Trading site wouldn't be going to ban. Might be they will create new tax law for crypto trading sites