What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

It didnt affect the loan because of the divorce decree, but it completely wrecked the borrower's credit score - dropped it 130 points from high 700s to mid 600s- because the mortgage still reports on his credit report and was showing as a mortgage late. 

It gives you a total livability score as well. https://www.areavibes.com/

Use median household income by zip code (and school rankings, to a much lesser extent). 

The harder part for you may be credit scores.

As you begin your REI journey here is one tip I have for you:Use this website as you are trying to narrow down the places you want to invest in. https://www.areavibes.com/Its awesome because it gives you a "total livability score" & you can compare different zip codes & streets to others. 

congrats my friendHere is one piece of advice I have for you:As you attempt to find what area to invest in, use this website https://www.areavibes.com/Its a great resource and starting point for what an area might look like and it has something called a "livability score".

What is your credit score?

@Justin FondrenIf your credit score is in the 700–730 range, you're in a great position to secure favorable loan terms.

lol, show me the Turnkey company who's scoring a $50k profit off the rip on their deals.