For line stick to 40lb mono.... its the standard for 'big fish'. You could go upto 50lb but its unnecessary. I've been spooled while using my Abu 7000 with 50lb.... had it been 40lb mono or even lighter, there's a good chance I'd have landed that fish.Guess you live and learn.
Use Berkley Big Game, Suffix or an equivalent. They're average lines.... No point spending all those $$$ coming to India and then skimping on line. Just not worth it.
I swear by the Owner cutting points. Size 8/0. On a 10 day trip at the VERY most you'll lose a dozen. If you aren't losing hooks at an alarming rate change them every day or if you get snagged (points are the first things that go). Gamaktsu Octopus Black is another decent hook in sizes 6/0, 7/0 and 8/0. For Mahseer avoid the 'Gorilla' hooks as they are too thick and don't bother with circle hooks.
Only piece of advise while fishing with ragi is wait for the pressure to come on, it's something you WILL feel, then strike as hard as you can
Tight lines and let us know how you do.