You don't learn it behind a computer screen. you learn it by looking at lots of properties.Note; the above is regarding SFH.

Effective screening of prospective tenants is so critical that I cannot empathize it strongly enough.

Ask them how they screen people.  

Read up on tenant screening before you put someone in there.

Have you considered tv or radio advertisement?

Ignore virtually everything you see on TV, as most of it is a lie or grossly exaggerated. 

If you promoted that in lieu of leasing, it is possible that a property manager may screen less well if the tenant profile is more conducive to a long term tenant (aka, I'll sign a three year lease, etc).

Have them help underwrite the deal, have them help screen contractors, etc.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

Quote from @Andrea Miller: Go to BUILD YOUR TEAM at the top of your screen, and you can search for other MEMBERS or LOCAL MEETUPS.