Need advice on how to become a published Author in India and the process involved ?

I am 21 and want to be a published author. I have few questions regarding this:
1) Why one should be an author? ( itsnot only my passion but I see this as an earning opportunity too)
2) Are writers master in their language or it is the publisher who make it more grammatically correct? ( I think there is lot more behind the scenes drama)
3)My mother tongue is Urdu but I do know English so shall I write in Urdu or English?( it will be easy for me to write in Urdu comparatively with English but English has more opportunities and readers)
4) What steps are involved in writers mind to get the book in the readers favourite list ? (dreaming )
Experts: awaiting advice.