Question about "syndication-like" investing in a BRRRR?

[Cindy Coker]

A group of us are looking at ponying up $50k each, or so, for a friend to buy, fix, flip a tired but rescuable As-Is house in a sweet spot. He's done 20+ of these, including working with a few of us on our own projects in between his own. 

Looking at each investor putting up cash, with an agreement that he pay back with interest when sold, in 12-18months. No question that that is doable, but what paperwork should be executed to establish good clarity for investors? 

It's kinda like a teeny syndication, or semi-hard money lending. Are there agreement templates you guys can recommend?

Thanks much,

Cindy Coker

Asheville NC