Comment on Kite Connect APIs for programmatic access
Hmm.. I’d suggest you to start learning about markets here: http://zerodha.com/varsity/
1. Since we charge very less brokerage, your real returns when doing equity delivery starts almost at 0.3% above your purchase price. Capital gain tax is a % of your profit.
2. :), don’t think anyone can answer this. Do start reading up, and if you are trading/investing start very small.