Procedural questions relating to name change like place of publishing

1) I got a notarized name change affidavit last month in Bangalore but it was only signed and stamped by one notary member. Online it says there should be two witnesses while other websites say just one is fine. Is it fine to proceed with just one? If not, can I just go to another notary public office and get it signed or because it was dated last month, it would not be valid? Should I just start over? 2) My current passport was issued in Mumbai and I have been living there with my parents until college. Now after college I have been working in Bangalore but I don't plan on living in Bangalore beyond the summer of 2018. The newspaper ads have to be in Bangalore right or can they be done in Mumbai? 3) When I am getting my new issued passport, does it have to be in Bangalore? I was planning to do it in Mumbai as that's where my current passport was issued and where my permanent address is. Would it be fine to do it there if my affidavit and newspaper ads are in Bangalore?