Need help deciding fair split for partnership

[Ross Zachs]

Hi All, Have done several single family house renovations for personal use and vacation rentals. I have a good friend who wants to be a sole investor in my new flip project. I want to be fair on how to split up any profits. He will put up all the cash for purchase and Reno costs. I will find and manage project. If both of us are happy at the end, the intent is to continue as partners on future projects. 1) what should the split be? Should he get more of the profit since he is the sole money person?2) Should the split change after first project? 3) What other key details should be covered in this agreement? Thanks for any help!