My recommendation would be to engage an investment property focused realtor (not a general residential realtor) and let that person guide you through the process from pre-qualification to market/property valuation and selection. 

The key is not the number of properties.

@Maryann Nichols You will not find any properties on BP to flip.

Has your property been improved by getting the WH?

Quote from @Dawn Harris: We have a STR managed by a property management company.

Just google all the property management companies in your area.

We don't want to bring on every owner or every property unless they fit within our target market, so, I do the far majority of the sales - this is our check and balance.

STR Property management is common and I know a lot of folks doing this.  

She will get a nice surprise next week when I show up at her door to (a) announce that I am her new property manager and (b) notify her that I will update her information with the collection agency she's been hiding from.Screen your applications, people!

As a sole operator, you have all the policies and procedures in your head and can apply them to many properties without referring to a binder.