Hey Guys I dont know if this thread should go here or not - so excuse me if its placed in the wrong forum :)

The thing is I am a midstakes grinder abi~30-35ish. I want to move up the stakes and have considered getting a coach (for the first time in my carrer). I have a contact with a coach which is considered among one of the best coaches in my country. I respect his game a lot and he has proven results both coaching and playingwise. Usually he charges 150-200$/h but that unfortunately is too much out of my current bankroll to take out to coaching - and I really dont want to jump much lower than now since I am very comfortable at this level.

Then he suggested that he could coach me for a part of my profit. Since I never done stuff like this before i have no clue how to decide what is fair. Fwiw I dont think he ever did a deal like this before either so we are both on new ground here.

Do you have any suggestions for how to find a solution that is fair for both parties? All inputs are highly appreciated :)