Questions to Ask Investors and Flippers When Finding Them Deals

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Hello BP fam!

I understand I should first focus on finding good deals but what specific questions should I (newbie bird dog) ask investors and flippers when building my buyers list besides "what's a good deal for you"? (i.e max pp, sqft, property type, neighborhood class, rehab budget). How can I help them with the due diligence process prior to presenting them the deal? 

Thanks