Getting Ready To Do This Thing - Need 1 Thing Cleared Up

[Autumn Alexander]

Hi everyone!  I'm going to break into real estate with wholesaling - So, I've been working on smoothing out my business...creating my systems....building my connections and network, and preparing to start advertising for sellers.... I just have a few things I need cleared up....

As a wholesaler....I know I need PSA with and/or assigns and the contingencies and an Assignment contract (or i'll be double closing - depending on the situation)...this is when i'm on the sellers end....but what about when i'm on the buyers end....for example...Lets say Mr. Rogers approached me and said he had 4 acres of land for sale and its a great wholesale opportunity...i introduce the deal to my buyers, one of them is interested in Mr. Rogers deal...how does this situation work out? Are Mr. Rogers and I supposed to have some sort of written agreement about my part/payment in deal? Does that happen when we're discussing the deal or after my buyer comes forward? 

So I guess my question sums up to - What is the typical protocol when I have a buyer that is interested in a property that isn't under my control? 

I want to be professional about this and not get burned.  

Thank you for your help!