Thanks for stopping by the Apple Support Communities. From your post, I understand that the display of your iPhone 6 needs to be repaired, and you have some questions about how to make that happen. I'd be happy to help!
First, you should bring your iPhone into an Apple Authorized Service Provider in India. An Apple-certified technician will be able to inspect your iPhone and assess the extent of any accidental damage, then provide you with repair options, including any estimated repair cost. You can find locations, get contact information, and set reservations for certain locations here: Apple - Find Locations .
For more information about the service and repair process, you may also find this page helpful: