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

I owned a rental in 2015 but sold it to make a big move to Florida.

@John Paul Palace their bggest challenge is finding competent PMCs to recommend to their clients.That's what most of the negative feedback here on BP is about them - which is UNFAIR as they're selling a rental property, NOT PMC services.Recommend you do your own due diligence on PMCs before just going with their recommendation.

So wholesaling flip and rental.

The things that give a rental a value in cashflow are benefits to the tenant in the form of living amities. 

We’re debating whether we should sell our rental property to pay off all our debts.

As for financing, on a conventional loan if you do not need the rental income to qualify then you would not need to have the property rented but if you do need the rental income to qualify then you would.  

Quote from @Jonathan Small: I have had section 8 rental since 2008. 

Quote from @Brandon Morgan: hey guys I am new to real estate and I just got my first rental property this past year and have tenants and things are finally stable now.

If I were in your position, I would buy a duplex that has potential for value add, fix it up, live in one unit and rent out the other unit as a medium term rental or long term rental.