At least roads, utilities, and the amenities got put in.I also think of Lake Whitney south of DFW which is more or less in the same position. 

You can find vacant homes by driving around town, hiring a bird dog, getting a Investor friendly real estate agent, talk to the mail man, tax collectors office, zoning office, you can even try call utility companies.

how to reconnect to utilities and back to sewer, what should be done prior to rebuilding and do you need a new slab or foundation?

They should cover your most common hurdles.

What are some good strategies to get accurate utility costs, vacancy rates, and insurance estimates so that you can calculate NOI and cash flow to take to the bank for loan approval?

Lease space and pay their taxes, utilities, etc.

Do tenants pay all utilities?

Most residential financing here is amortized over 25-years, while the term of any given loan will be 6-months to 10-years with 5-years and 3-years being the most common terms.  

The more exposed walls, the higher the utility cost projection, the lower the allowable rent.

Even with those items, he still got a 4.9/5 rating with over 30 reviews.I plan on having utility towels (its at the beach.. there are motorcycle and jeep weekends).