As the link suggests, check thoroughly with the Embassy before you start planning the trip and carry necessary documents (hotel/domestic-travel bookings, medical insurance etc).
http://www.mfa.gov.tr/visa-information-for-foreigners.en.mfa
Good Luck!!
Happy Travelling!!
The e-Visa for Indians costs 43.70 USD, and allows you a single entry, and you may stay up to 30 days. REMEMBER: The e-Visa is valid for 6 months so if your plans change and you don't use your single entry, you would still have a little time to use it. Apply for a Turkey visa here for Indian passport holders:
https://www.evisa.gov.tr/en/
For any foreign travel buy ticket in advance to get best rates
Apply for Turkey visa well in advance . You can check VFS Global website for visa details