How to determine finders fee?

[Frank Rizzo]

I am a real estate investor, I own 23 units over 9 properties. I recently was approached by someone to help them get started in real estate. We agreed the best structure would be a finders fee to help find and stabilize a property. It will be some work for me considering he wants to recoup much of his investment with the BRRR method. I would probably help him through the process of analyzing deals, rehabbing, and renting. I am trying to determine what a reasonable amount is for a finders fee. Does anyone have any experience with this that can provide some insight on how to structure a deal?