What is the AdSense revenue sharing program?
Google introduced its online advertising program long back and whichever website is eligible and has applied for an AdSense then they may either get approval or rejection. If Google approves your application, AdSense can be used on personal blog/site or multi-members' website (like this site, Techulator.com). For those who have an approved account, they can use it to participate in AdSense revenue sharing program where they share a certain percentage of earnings on content as long as it follows Google AdSense policy.
Whatever income comes to Google from online impression ads / organic traffic and clicks from the website will instantly go to your AdSense account as per the sharing agreement. Once you reach the balance threshold of $100, Google AdSense team will transfer the payment to AdSense member's bank account in the next calendar month.
You can find more detail here https://www.techulator.com/help/2708.aspx
Where can I find details about that?
You can check this link for detail https://www.techulator.com/help/Index.aspx?keyword=Google%20AdSense
Is there any examples of the best AdSense revenue sharing programs?
Google is top for revenue sharing. There are few competitors for them but they won't come close to Google as of now. The best AdSense revenue sharing programs can be seen by online research and their status changes time to time based on those websites contribution at that time. For example, few websites were once dominated to earn huge AdSense revenue but failed after a certain duration due to search engine algorithm updates or due to inactive at the website. Few unknown websites become top-ranked in the search results since they comply with the policy and do regular contributions without fail. The content speaks here. Many popular websites don't reveal their online or ad revenue but their earnings through AdSense are quite handsome.
What are the websites I would take as an example for AdSense revenue sharing program for Indian writers?
Try to visit www.indiastudychannel.com as an example (Education niche). The website may have less revenue compared to its past history but that websites' Indian members are getting huge benefits based on their contribution. This (Techulator) website also is a good example in Tech niche. There are few more such websites around.
How and where to start as a beginner ?
Try to participate in Forum of the sites (like Techulator, IndiaStudyChannel and Google Forum) for a better understanding of the subject concept. And, try to post a reply of a few words that come to your mind and proceed accordingly.