Specifically, how to go about managing unrelated persons living together per county or city ordinance and lease structure. 

Now, in areas where a majority of the sfr's are vacation/str's the considerations are different.These comments are in response to some of the other posts.

Is it true that you have to attend the auctions in-person and cannot buy online from another state?

I had a person quote me $1800 for a drywall patch.

. #2 because most property managers are too overwhelmed with the volume of units they manage to give you personalized, meaningful service. 

At that point, hopefully the seller has a firm understanding of your requirements for an investment and its a simple yes/no response.

Outline all the rules, responsibilities, and expectations for both you and your tenants.3.

Please read these two threads that address your desire for a responsive tax person:https://www.biggerpockets.com/forums/51/topics/998718-explai...https://www.biggerpockets.com/forums/51/topics/1042619-strai... 

I appreciate any insights or personal experiences you can share.

Over 50% of the numbers were disconnected and of the remaining 50%, at least half or more were definitely the wrong person.