Need help with a contract

[Shaeida M.]

Hello BP family!

I'm a newbie and I don't own a company. However, I want to broker a deal. Party A is looking for a 25,000 sq ft property to place his gym/ wellness center. Party B has a commercial property that would be great.  I took party A to the location and he's ready to place an offer. I spoke with Party B and he said he will pay me a finders fee if the deal goes through. What type of contract should I provide to ensure I receive the finders fee and the deal is not processed without my knowledge? Thank you!