PR has a vast array of opportunities but presently I think to make a sound investment decision it requires boots on ground to get a feel for the specific town or area you find most appealing and marketable and do your own research  there with professionals in the area ( real estate agents, attorneys, property managers etc).

Metro Detroit isn't block-by-block, the City of Detroit is.Most OOS investors make the mistake of NOT separating the City of Detroit from the rest of Metro Detroit - they are two vastly different markets.We're in the Metro Detroit area, so you may want to follow our blog here on BP, but at least read the following posts:Follow our "Deep Dive" series we're doing about Metro Detroit cities and City of Detroit Neighborhoods: https://www.biggerpockets.com/...How to “Screen a PMC Better than a Tenant”: https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processes

The forms library that they give you has every form and how to find the parks they provide the marketing samples that you need to use and they cover how to correctly evaluate a park as well. 

How vastly can a single vs multi family home's costs vary and what is the best way to calculate the difference?

It’s important to assess how a market will perform by ensuring that there’s a vast variety of guest pools who will have need for MTRs.

No, you don't need to buy any course to get started especially given all the free information on websites like this, the library, and YouTube.

The vast majority of lawsuits against Landlords are for wrongful eviction, security deposit disputes, and Fair Housing Violations.

I suggest you follow the following steps:(1) Gather Information=> Begin reading books from the BiggerPockets library, especially those by Brandon Turner and David Greene.

Typical figures for Toledo Ohio are something along the following lines:Price in 1945 - $14,000Value today of $14,000 in 1945 dollars - $235,949Price in 2023 - $100,000In short, the vast majority of those properties not only failed to appreciate but actually lost you a significant amount of money over their life.  

In tandem, I'd continue to educate myself through websites like this, YouTube, podcast, and my local library, and go to every meetup I could to build my network and hopefully get connected to the vendors I'd need like realtors, CPA, lenders, contractors, closing attorneys, and wholesalers.