The zoning compliance must either be legal, legal non-conforming or locations with no zoning.

I was debating if I should partner with a friend or family member who is willing to work on a property together. ill be sure to make sure things are done legally and fairly so no one get short sighted and things don't get messy.

If you have a buyer's agent, you should have already signed a buyer's representation agreement and that fee/commission is disclosed in that document so you should very well know what that charge will be.If you were the seller and going to owner finance the property, what would you want to see from the buyer that tells you that they will be able to pay the mortgage moving forward. 

I really need to get my money back or pursue legal measures against BiggerPockets .Please advice  Sorry for the inconvenience.

Appraisal is not the same thing as legal.

This protects your investment and gives you leverage if there are issues.Other Tips:Make sure the lease explicitly defines the move-out date.Conduct a thorough walkthrough with documentation before and after the lease period to avoid disputes.Handling a seller-to-tenant situation can be tricky, but with the right precautions, it can work smoothly.

They will not provide you that documentation.

Is there any legal notice i should provide to the tenant as per the laws? 

Unfortunately, some realtors don't respond to their phones, some HOAs have outdated contact numbers, and some CC&R documents are not up to date.

Any good HML will be happy to share the contact info of borrowers so you can see how easy the process was and how well they treated the investor.Can you share a recent closing document or HUD?