Visit the link-Passport India
It will show you the documents required.
Create an ID and Sign IN.
Use the "e-Form Submission" which I personally felt as the better method.
Remember since you are a minor your parents presence and their passport(If Present) is required.
Read the instructions completely and do everything.
After submitting the e-Form through your ID, pay the fee and select your PSK according to your convenience. Your appointment will be confirmed after successful payment.
NB: Use the Toll Free Number(1800-258-1800) only if you have plenty of time to waste.:tup