Investing in flips, what should I know before I invest!

[Anthony Jackson]

Good afternoon guys I have a question about investing in a flip. I know a guy who flip houses and he wants to know if I would invest with him as a part silent part active investor. I don't mind he has promised good returns but I never done this. So what should I know before doing this and what questions should I ask and answers should I get from him??? Please help!