Answers to your questions:
1. It's completely safe to provide Zebpay with your PAN card because they are secure and trustworthy exchangers in terms of Bitcoins in India.
2. Coinsecure asks you for documents like Passport, Driving License, PAN card, etc. of which you can provide them any.
KYC means Know your customer, it's a check that these exchanges do before allowing you to trade there. IFSC code is a code that is specific to your bank and bank's branch and city, and is needed to link your bank there.

You can ask anything here too, and we will help.

First of all welcome to crypto community ,zebpay and coinsecure are safe and quite fast in transaction.there are thread called 'help' and "introduction" ,you can visit there for your query.