My best understanding from talking to reps is they have one local employee (in addition to vendors like cleaners, landscapers...) per 10 listings/properties. 

Duplex have different zoning that may permit additional units.

Buildium and Rentprep will also need the video tour, and the home office ownership or lease info if you want to be able to run credit/background checks directly without having the applicant submit and then approve you to receive the data.

Purchasing the LLC gives you ownership of the property, but it also opens you up to additional legal exposure since the entity has been active, and there is no way to really know for sure what else they used the LLC for.

Give her 30 days notice now, keep her security deposit, and send her a additional bill for damages to the unit in lieu of taking her to court for the damages.  

An offer was received that I accepted. 

Additionally, make sure you’re familiar with local property laws and any regulations that could impact your investment.I agree with @Jason Wray that you can easily find a cash flowing deal under 200k. 

Duplex have different zoning that may permit additional units.

Soon I will receive some capital (as the outcome of my divorce).

Where I live there are many benefits to the voucher program in addition to guaranteed payments.