Hello Every body!

I am Pradip Kumar Bose from India .I am doing research on the Bose Family Of Mahinagar(West Bengal), India, to which I belong.I have been able to trace five generations of my ancestry and am stuck up now.I require help to proceed further (or should I say backwards).
Incidentally, I was surprised to see so many Bose surnames outside India. Here, in India, people mostly from Bengal(known as Bengalis) have this surname.
The Bose surname here has originated from two locations that I know of (there may be others, but I am unaware), one is Mahinagar, and the other is Baganda(also in Bengal).
Hope to hear from some of you.Thanks.