Private Lending Basics

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Good Afternoon fellow BiggerPockets members!

I recently received an amazing opportunity to become a private lender in a flip in my neighborhood. I've done some basic underwriting and the deal looks solid. That being said, I am a new investor and would like to make sure my assets are covered. What are the basic things that a private lender needs to have with every deal? (i.e. documents, collateral, promissory notes, etc...)

Thank you for your help and guidance.

-Sean