Legal procedure of name change in India

Sir/Madam: I write you to request the legal procedure of name change in India. I have made an affidavit using Delhi non judicial e-stamp paper and it notarized by a notary public in Delhi after publishing the advertisement in newspapers. But before making the affidavit, I have published the name change advertisement in a local and a national newspaper (Indian express Delhi edition and Janasatta) for Central Gazette notification. 1) Do I need to make again the affidavit and then publish the name change advertisement? 2) I belong to Kerala State and now I am residing in Delhi but I don't have an ID, proof of Delhi and all of my records like Aadhaar, pan card etc, belongs to Kerala state. 3) Can I make an affidavit using Delhi non judicial stamp paper or I must use the non judicial stamp paper of Kerala State for Central Gazette notification? 4) Can I publish the advertisement in Delhi edition? Or Is it mandatory to publish a newspaper in Kerala State also?. 5) Does the pro forma need to be signed by two witnesses in the gazette Officer rank from the state of Kerala or Delhi? I look forward to hearing your valuable advice. Yours Sincerely, Sreekumar G