If you just what to document it you can use this agreement https://www.docracy.com/6348/founders-agreement-template

As others have said proven businesses like a butchery for example “selling meat” has no value you can’t stop others from entering the market. You have to share what you do that’s your UPS and why customers choose to work with you. If you build good systems and the venture is profitable you’ll attract competitors they’ll help spread the idea and it’ll move further toward mass adoption. There are lots of computer companies and just one Microsoft.