How to I protect myself?

[Moises G.]

I am currently working with a liquid investor who has agreed to pay me a wholesale fee for all properties or connections I send him that result in transactions. I recently acquired a good contact who specializes in trustee sales and we should be closing a lot of deals soon. My concern is protecting my commission. I am not an agent but is there a form or contract I can have my investor sign that will insure I get paid? He could easily take my connections and cut me out. How can I prevent this? Any advice would be greatly appreciated.