If this unit shares the address and the utilities with the main house then it would certainly be considered a 1 unit home. 

To start, I'm eyeing foreclosures and I have identified a couple attractive ones (in good school districts, right price point, etc) and I intend to try and get a walkthrough on those properties.

Reason that it has attracted me is because they yield is so good and cost is substantially lower.

I have developed a very good marketing pitch and I would like ideas about how to attract serious investors.

I mainly looking to get into BRRRR properties or just buy and hold rentals for now but definitely would like to get into flipping once I'm able to move back to Pittsburgh.

You can definitely read books on rental properties in general, and maybe a little bit on management (out-of-state you'll likely be needing to manage the property manager as your main duty).While I can't think of books specific to it, there are still lots of resources.

Another option if the main reason for you wanting to exit these investments is that you don't want to do the repairs yourself any more would be to hire a property manager to handle all of the maintenance, showings, and rent collections. 

Two main reasons. 1 is we make money a whole bunch of ways as I described above. 2 is you cannot keep all properties as you will run out of capital.

https://realtybundles.eu/blog/12-real-estate-in-hungary/39-why-budapest-real-estate-market-is-so-attractive-to-investors

If its just for buy and hold, I will do small work that will attract tenants and leave it at that.