Opening a brokerage firm with zero experience is nearly impossible. Not just for the experience part, but also the crores of capital that is required. Its not easy like opening a snack bar or grocery store.
I think you are looking for "Sub-broker" firm. Just contact a few broker firms and they will tell you what all documents, capital and other formalities are required. However, don;t signup with any of the brokers soon. Come here once again so that we can have a peer review.