You use those things as leverage and a plus for the buyer pool.

SpaceX now has a rocket testing center right outside of Waco, Amazon is currently building a huge distribution center in Waco, and BSR Surf Resort & Cable Park built the #1 wave pool and cable park in the world, making Waco an international surf and wakeboard destination.  

Single LLC: Easier to manage but pools liability risk across all properties.

The investors would be advised to pool together some capital to retain the services of an experienced securities law firm to do an analysis of whether they have cause for complain, cause for lawsuit, and reasonable chance of collection.  

Duplexes are worth quite a bit more per sqft than Fourplexes as there is a larger buyer pool and it opens to the non-investor customer.

These tenants tend to be reliable and respectful of the space—often more so than the varied guest pool with short-term rentals. 

Again, not sure on your market but if the empty lot is so far out of town, then who would be your tenant pool?

Very inspiring because I am jumping into the pool very soon.

Also any must-have amenities like attached garage and any must-not haves such as a pool.

However when you think about the number of active people on the forums vs the number who are in that specific area and have hired property managers (meaning they're not self-managing) the pool gets a bit small.