It sounds like there is a lot going on with this. My first thought is if you find him an off market property. What condition is it in? Many lenders will not make loans on properties that need a lot of work. There are exceptions. But since you're just getting started. I don't know if I'd advise you to tackle this one. Normally when we wholesale a house. It's to a cash buyer, no banks involved.
@Mykhail Bolden I believe the FHA loan would be the deal killer for trying to wholesale it. As others posted, wholesaling works best with cash.
Maybe just go a straight referral fee? He pays you a $1-2k if you find him a good off market deal he ends up purchasing.