you need to book a ferry from the starting point where a small shop is located where you can book. Rates for ferry and other expense.
Max 12 people 3500rs(if you have 10 or 8 or 2 people then too the rate is 3500)
150rs boat(additional cost for the boat again)
30rs per person(forest fees)
300rs guide(mandatory to take the guide = the boat rider is your guide only)
50rs camera (if you have one)