Quote from @Cynthia Lee: Accepting even $1 could be seen as evidence of a payment plan, and the entire eviction process could be derailed.Once you start the eviction process, to not accept any payment unless it is a full payment in certified funds (cash, money order, cashiers check).

Is in there, but a great thing you can do now is get your "core 4" figured out - agent/lender/manager/contractor - obviously you can adjust this and do one of the pieces yourself (self-manage for example) or don't need a contractor if you do only turnkey etc but getting this nailed down early is key

Basically common contract or agreement law.

One place that will soon become a rental market heaven is an area around Johnstown/ New Albany where a huge Intel plant is under construction with plans for thousands of employees, not to mention the contractors there now. 

@Kash Tacke I'm a big fan of ADU's in general especially here in the mid west, yes you could potentially be on the front of the wave, but housing density is the solution to the affordability issue, anytime you are investing with affordability in mind is a great strategy to me, and sound like there are some incentives or at least supporting winds form the local city, that in itself seems like it would be worth at least approaching an architect or contractor to bid up some plans or concepts to take tot he city.  

It’s also worth connecting with a property manager and contractor early, even if you don’t need them right away.

Hiring a contractor to assist with repairs and a property management company to manage rental.

Expect a custom ADU to take 9–18 months, with 3–6 months for design and permitting and 6–12 months for construction, depending on complexity and contractor availability, and the speed of processing permits.

I should have mentioned that I am out of state in Colorado and I'm not connected yet to contractors that I trust to do a rehab.

Hire an HVAC contractor to go check it out, of course.