Joseph, the best method for you would probably be the MLS or sites like realtor.com etc.

I own a duplex property (I do not live on site) and I'm renting out the 2 bed/1 bath back house.

While both involve finding and properly securing a site and bringing it to full entitlement, the ground-up process includes the land piece but gets way more involved and complex to execute.The full "Monty" for ground-up development needs to include financial literacy, an explanation of metrics, and how they work.

But I also love the idea of investing in real-estate and utilizing its tax benefits I have read around 10 ish books or so and the one I am reading right now recommended this site I am looking for some advice of things I can do to either prep for an investment into real estate and or do right now.

Spreadsheets/Templates:If you don’t want to start from scratch, sites like BiggerPockets and others have pre-built templates you can use to run your numbers and track your expenses.

I couldn't find anything too specific on the site.

We live in Lakeland, TN 20 miles from the Blue Oval site and I recently had a new BO employee rent one of my homes with a potential to sell in the Spring/Summer of next year.

There are sites out there like passive pockets as well as this site where you can find out a lot from people who have invested with that fund.

Seems like 130 units is a beast to manage, I'd love to hear about your on-site management systems and "experience management" process to stand out amongst the fierce competition in the smokies. 

You can also look at sites like auction.com, homepath.com and homesteps.com.