New to Flipping and RE investing

After working as a home improvement and renovation contractor for almost 30 yrs. I have just started in the business of REI. I have a couple of private investors that would like to get involved in my new business. Anyone have info of what kind of contracts or agreements are used in this process? I am in N.Y. if that makes a difference. I understand you can make any type of deal with the payback method but, I would like to know what the norm is or what works for other members here.

Thanks in advance
Bob

In the deals I’ve done with partners, we just wrote out a document that explained everyone’s responsibility for work, how the profits would be split, etc. and we all signed. If you need something more solid, you could always go to an attorney to write something up.