Each site you evaluate is another step forward and you'll learn more along the way.

Is there anyone they partner with here to put on US MLS, eBay, FB, all the social media sites, craigslist, land watch, land.com, etc.Who is your target buyer? 

For estimating rehab costs, try using the BiggerPockets Rehab Estimator Tool or get quotes from contractors through sites like HomeAdvisor or Thumbtack.

More specifically can you get utilities to the site?

but I suspect homesites will drive the best values.. no one wants logged over sites for building ( generally speaking)  it works here in the Northwest because of the incredible shortage of buildable land. but in other areas not so much

Also these deals are not one out of 100 they are the last 3 i have closed on to keep, you can verify on the county site.

If it's a simple living room to bedroom conversion, it likely won't be that difficult to return to "normal" if that's ever needed but definitely a great thing to keep in mind.

I own my own house and I own some land out of state, so I have assets I want protected.I have quotes and will be purchasing an insurance policy that provides 1 million in landlord liability and I can also purchase an additional 1 million in an umbrella policy.My question is, is it even possible, or has anyone heard of a landlord getting sued and losing over $2 million on a simple duplex?

When you say the 2 plex appreciates more, are you talking about forced appreciation or simply the value going up as the market goes up, what I'll call simple appreciation?

I think tracking productivity will be tough unless you have someone on site that is checking their work at the end of the day and documenting their progress.