I setup one QBO (Quickbooks Online) account to handle multiple LLCs. 

Theres a lot of place online to list like apartments.com, facebook marketplace, realtor.com, trulia, rent.com.

Quote from @Lisa Broderick: Crazy that anyone would think that's a good investment.I learned what I needed to know by reading a few books and asking questions online.

I'm currently navigating the complex process of finding a reputable asset protection attorney with expertise in real estate.

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.

Quote from @Isaac Ballew: Go to indeed.com or monster.com and look for a job with a larger, reputable property management company.

Sadly, it’s sat on the market too long and I’m looking to get creative with bringing the attention of many buyers looking for a good deal on a property (online auction or something else with tons of attention??)

We currently have 105 units and are using a variety of excel, google docs/sheets/calendars, apartments.com (ads and rent collection), docusign and QuickBooks online (which we would like to keep). 

Check out other online guides available here: https://www.biggerpockets.com/guides3.

The WORST solution is an unqualified attorney, because their mistakes makes whatever they come up with INFERIOR to an “off the shelf” solution.In between the two we have a good off the shelf product by a reputable vendor.