I feel like I’ve walked the street without ever having been in the state.

What financial challenges have you faced in the process?

I am exploring the possibility of purchasing an off market plot of land, building a modular home, and then selling it.

That's correct and having access to the mls 

Ideally, you'd want to have signed leases from each tenant, but the strategy part of it is that you also wanna make sure that you don't run people away while you are either increasing rent or preparing any units that are currently vacant.I would probably take a step-by-step approach.

Yes, just post the numbers.  

What was the extent of the rehab for these?

Quote from @Blake McWilliams: Using and running a CRM is what you need to help the business you have in real estate grow.

Now, if you're buying in the name of the LLC and you're doing a DSCR deal, that will be irrelevant.

One thing you will want to explore is the tax rate in the specific counties you are looking in.