Is there a method for this?

I want to provide client to someone who master a skill for example if i have a guitar account and instead of selling material stuff i sell a service like learning how to play it even if i can’t do this i know i can provide shoutout for people that do that but instead of this i want to focus on the business side so i can make it easier for the provider but i don’t know how i can do that i saw that there is fiverr that provide affiliation but is there any other method ?I know affiliation work for this but i don’t think it’s for a type of service

Any idea about that ?