If you have trusted family members, and they are willing, of course, then yes, they can be your boots on the ground. 

Most ADUs are ground up and are cost prohibitive. you need to contract dwelling units under 1000 sq ft at $250 per square foot to make the numbers work as a builder in columbus. the cost of an adu and rezoning I'd pass on this one.

I'd work on building your network and ground team before going the self-management route.

Out of state Investors who have appetite for the NY area market and surrounding should reach out. 

Having 3 furnaces and 3 hot water tanks would take up most of the room on the ground floor where I had a small one bedroom collecting much less rent if none at all.I would have to replace 3 boilers and 3 hot water tanks when it's time.

Two doors down is a quadplex I built from the ground up at the same time and around the corner is also a quadplex and a duplex I just finished.

Settling in florida is normal because of the sandy soils with high ground water. 2.

Now it's true that lead dust samples are taken from the ground, usually around windows, but putting top soil on top of the ground would be the route to go there.

For example, I've recently spoken to someone about their MTR in Montgomery and they shared their MTR experience has seasonal occupancy, hard to find boots on the ground, contractors are slow and many do not take credit cards for payments, etc.

Their seller side commissions are half of what's usually standard in an area (1 - 1.5% vs. the traditional 3%) I know you're asking about FSBO but maybe Redfin could be a good middle ground for you.