Comment on Taxation for Traders - Introduction
Deb,
1. Intraday equity and F&O are both considered as a business, so you need to add this income and along with your salary file using ITR 4. The good thing with ITR 4 is that you can consider all those costs that you incurred toward trading, like internet, mobile bill, subscription, depreciation of computer and etc as expenses.
2. You can be an individual, no need of propreitorship/partnership/pvt ltd.
3. Check this for turnover.