Where to apply for Nationality Certificate in Mumbai

I want to request for information on Nationality Certificate.

Is there any specific form to be filled ?
Is there any application format to be made ?
Where can one submit this form or application in Mumbai ?
To whom should this application be addressed.?
Where is the office situtated in Mumbai ?
How much time is required for getting the certificate ?
What are the documents to be submitted alongwith the application ?

Kindly help.