Awesome, glad this interests you!
I often get requests which I either can’t do or don’t have time for and I would like to pass those to you if they fit your skill set and price range. At the same time if you are ever in the situation where you get a client request you can’t do or don’t have time for, feel free to pass them to me.
In short, if I send you a client, I expect you to actively send me 20% of whatever you charged that client. If you send me a client I will send you 20% of any payment that client made to me.