about 125 to 135 pounds is the average - but it looks he'll be a tad smaller (dogs don't seem to get really huge in India lolz!)
's'ok, gives me a starting point. Ok, assuming he doesn't totally have cannon butt from the chicken leg.....
Start with JUST CHICKEN. Light or dark doesn't matter, but just chicken with no organs (skin on is fine). Lotsa bone to start with, but eventually you want to work him down to no more than 10% of his daily intake is bone. Once you've done that then you can introduce beef (keep feeding chicken for the bone). You may have to up how much bone he gets when you do that, but reduce it back down as you can. Then intro organs (see below for amount). And then do the same with any other meat types you feel comfortable with (for example if you can find occasional goat without breaking the bank).
You may need to add fish oil (or feed fish if you can), and if you get really lean meat you may need to add some sort of fat.
Ideally I'd like to see more variety, but what you can you can.
If he's estimated to be 135 then his starting daily intake should be 3.38 lbs of food. You can adjust that if he seems really hungry, or not that hungry.
Of that 3.38lbs 10% is his bone intake (0.33lbs), and 10% is organs (also 0.33lbs), the rest is meat.
Organs: heart actually counts as meat not organ, so if you can get heart cheaply feed it for meat, but go slowly introducing it, some dogs find it really rich. Half of his organ intake should be liver, the other half as many other organs as you can get (kidney, pancreaus, brain, that sorta thing).
does that give you a starting point?