Specifically, I’d love to hear about best practices for managing shared spaces, screening tenants, and setting up house rules.Additionally, I plan to split the utilities among the tenants—any advice on how to handle this efficiently would be greatly appreciated!

Now purchasing a home with cash is always good b/c obviously cash is king but also I think the part you might've missed is that, the money your utilizing on these home's won't actually be yours, but the banks or whatever institution you used to fix the home or make its value worth more.

Cost segregation utilizes the MACRS approach.

And via the clustering we are utilizing green-space in a communal manner thus reducing foot-print of that BUT retaining such perception as each unit has walkout to what seems a BIG green space.

I have over 100 lots to build . utilities in place 800 people on waiting list for section we need houses.i am also a sec 8 landlord 

How are they picking markets?

I would pick a market area you like and start doing a bunch of deep dive deal analysis, but from a rental and not a life style standpoint.  

HOW TO SHARE UTILITIES 101You have a property with two or more units and the utility meters are shared.

You can also tell her to call the utility company about the best way to save, as turning off heat and on is not efficient having to run longer blasting out cold air as opposed to leaving it set at a lower temp. :)

lots to learn here just browse around and you'll pick up on stuff and know where to hone in more im specific areas you are interested in.