Search the owner name, work backwards thru property appraiser/clerk if court site.

@Josh Hackett  If you want to follow @Jay Hinrichs advice, do a search for local business brokers. 

Do you suggest anywhere to start searching for multi-family fixers in a decent neighborhood north of Dallas?

Search through BP for asbestos.

I am a new real estate entrepreneur searching for multi family homes in SE Michigan.  

In conjunction with your own searches, network with a local agent (you can probably find someone on BP) by e-mailing them or taking them for coffee. 

Google and check out CRM’s like Realty Juggler, Ixact Contact, Lion’s Desk, Top Producer, etc etc.  

However, hiring a property manager also takes some effort and you should never grab the first person in the phone book or the one with the lowest fees.You can start by going to www.narpm.org and search their directory of managers.

I'd do a search for "Best Places to Retire" or "Where Millennials Are Moving To" or "Where Job Growth Is Highest".

Bigger Pockets is such a wealth of knowledge that it is easy to get somewhat lost.You can search forums by category and scroll through the most recent for interesting sounding topics or search for specific keywords.