Short of specific decisions or clear law, the distinctions seem extremely vague, arbitrary, and a bit scary.

Salesforce is a great product and is extremely malleable to cater to what you are going for.  

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

I am also extremely interested in getting into the market there in Sandbridge myself.

It’s a powerful way to grow your portfolio steadily while keeping your financing costs low.If you need any help with financing or want to explore other options, feel free to reach out.

The tenants power was shut off for non-payment and I need to put the account back in my name.Recently my HOA sent me photos of my rental townhome with a gas generator running in the yard and the electric meter missing and shorted out.

Vacant properties with previous code violations can be extremely tricky!

You may have luck in the mountains, as you indicated but in my experience the prices up there are extremely high. 

That photo isn't in the listing and that home does extremely well!

She knows the Summerville/Monks Corner/Goose Creek area extremely well.