Being in the military will allow for you to use the VA loan.

In these "quantity" areas, you'll have a very hard time finding a buyer who has a down payment and can qualify for a loan .This is an article Jack Miller wrote about the topic.Making money from the earnings of poor people is like getting orange juice from an orange tree without any oranges on it.

My plan will be to purchase a vacant land with cash and finance the home build through a private money loan.

If not, they are plenty of free ones out there that can.As far as tools recommendations, I agree with Jonathan, HubSpot is a great free CRM that allows you to make custom tags/lists and can have contact forms embedded in webpages, popups, sidebars, or stand alone form links to easily share in email newsletters/online forums. 

Title company is asking for an Uninsured Title affadavit to refi out of a hard money loan.  

Another reason to raise rents if you go to sell the property it will be harder for a new investor to get a DSCR loan because the rental income is not high enough for the purchase price. 

You want to get the best loan you can.

The Solo 401k also allows for participant loans.

While no money is exchanged hands the bottom line in the scenario you have laid out you are giving the homeowner a loan that is paid from the sale of the home. 

Know how to fund your buys (bank loans, personal loans).