Take a flight tickets in such a way so that you reach India at least 1 or 2 days before your business appointment so that you can acclimatize yourself to Indian climate. You will definitely need a day of rest if you are travelling from far countries like US, Europe. Usually the business travel lasts for few days to maximum couple of weeks. So pack only the minimum clothes and 1 or 2 business suites.
Make sure you keep – Passport, Indian visa, Laptop with charger, Necessary documents for the business, Mobile phone with charger, Health kit with basic medicines, Camera, Business card etc.