Setting a price is notoriously difficult and involves guessing how much your delivery is actually worth to the client. No one here can help you guess what your specific client in India could potentially pay you.
To begin estimating a price, consider what a normal monthly salary (including any benefits) is for a job you can get. If you have never been employed, find the data for India online at a site like https://www.glassdoor.com/
Normally, one would target a higher amount than a typical salary to compensate for client risk and time bewteen contracts.
Your availability could also be a factor; if you have more work opportunities than you need, you can obviously raise the price.
How desperate you are could be a factor. The more you need money, the more you might need to lower your price.