Land where duplexes can be built are pretty easy to find.You will need 20-25% of total cost for down payment/equity for a construction loan.  

Are there keywords or anything I am not using properly?

This is a corollary to #3, but it's easy to see others seemingly doing well with something and want to jump on board.

Thanks for that tip; that is such a simple thing to setup but easy to forget and can lead to disaster!

I think my next steps are to find a CPA and attorney to help me structure everything, but that's why I'm here... to learn for myself as much as I can and to find out who I need to talk to and how to properly vet them.

You can set up google alerts for an easy way to stay up to date on where jobs are relocating to and how many jobs will be formed.

Every time it rains the basement flooded because he did not properly install a drain outside.

How easy will if be to get my cash back on a HELOC?

It is a very powerful and useful strategy when used properly. 

You need to determine the proper balance between what you invest, your strategy with the property, and the return you can reasonably generate.