My Quora answer to trademarking online business before starting up
I assume the question is to start within India. In India, you need not trademark it in the beginning but I would suggest you do an evaluation of your startup idea, come up with a prototype and register a domain name. This would be bare minimum requirement for you to start. Once you identify a revenue model you can register the trademark.
Note: Your product logo and name can only be protected by Registering the trademark.