I also did some investigating online and see the renter has a tendency not to hold down a job.I offered asking price (fair market) because it was the sellers bottom line and the fact there were already tenants renting.

I think you are answering your own question here - if you can't find reviews or much info online then....

Online title search companies.

I agree with the above that Quickbooks Online (QBO) will work for you.

Pro: In addition to MLS access your brokerage might provide access to other resources such as detailed online assessment data not available free to the public. 

The address was submitted to their red book and now shows up online as official address when I try to ship items from Amazon or similar websites.

All your first set of questions can be answered by looking online or calling several local competitors.Your accounting questions though, show such a lack of basic knowledge that you probably shouldn't be doing this until you have more experience.

Need to keep in mind STR license / permit restrictions when evaluating.  

We are almost 4 years into that property and we won't be able to refi or pull any equity out of the house until our 6th year due to mortgage restrictions.

I keep reading different things online.