I can't really help with any rental advice since this ($600K SFR) space is way outside my competence and, really, comprehension. 

The post from @Brian Eastman provides a comprehensive response.

I am looking for comprehensive training from one source.

Serve a Notice to Enter to do a comprehensive inspection of the units for maintenance and repair.

Using a professional solution for online applications would eliminate the risk from those items, so I'd seriously consider using Cozy.co if you're just looking to start as I believe that's free to you, while AppFolio or Buildium are much more comprehensive property management platforms with screening features built-in.

The reason I went with them is because while the deductible is higher, the coverage was more comprehensive than what my personal insurance agent could offer under a policy. 

You got no comprehensive coverage on the car?

The deal on Tom White provides a comprehensive answer.The Tom White property was a vacant house that I’d passed everyday for almost two years.

If you do not have someone you have done business with that you know and trust to get you a comprehensive bid that is turn key complete...well, going with the cheapest bid in hopes of salvaging a nonexistent profit will have only one outcome I assure you. 

The bigger pockets calculators are pretty comprehensive.