You'd hardly be the first couple coming from different cultures. While culture can certainly be a barrier, it need not be insurmountable. (For example, my brother-in-law, an American, is happily married to a Phillipina--their daughters will soon be in college.).
I think the most helpful thing you could do would be to work purposefully to establish the best communication habits together that you possibly can. When interpersonal frictions arise, can you put your emotional reactions aside and really listen to what she is saying? Do you have the courage to speak your truth to her in love and compassion?
If so, then you'll be able to navigate personal and cultural misunderstandings together.
Sometimes its even hard to marry a woman from own culture and one can run into troubles quite easy. Sometimes one doesn´t listen carefully enough because both speak the same language and in this case of being with someone from another country with another language, I think, it could be even little easier if one has to listen more carefully in order to understand.
All your questions are only about settling down in India. It is a great decision. There might be some negative facts too.
But Indians always ready to welcome foreign grooms. It is a multi cultural country. So it will definitely attract you.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.