There's nothing special about it beyond some added, very straight forward paperwork. 

Since the yard is already rough, I would keep the shed and see how it works out.Consider adding something to the lease that permits you to remove it from the property if it becomes problematic.

I wouldn't recommend setting up an LLC out of state if you are buying in Tennessee unless your tax advisor is looking to help you on strategy.. but from a numbers standpoint, it really doesn't make sense when you start adding up on all of the annual LLC reporting fees from different states and then it starts cutting into your cashflow.

I intend to add a closet to the den and make it a 3 bedroom adding value as well as remodel the entire unit.

Next, run the potential income against construction costs for adding up to four more stories to the building.

SMS, Direct mail, facebook ads? 

Quote from @Benjamin Bieber: Listening to the Bigger Pockets podcasts I hear the ads for rent to retirement all the time.

By adding an extra bedroom, and opening up the 2nd unit by restructuring some of the walls, switching around some of the rooms in the first unit to make it more inviting and give it a larger kitchen.

By having additional parcels, investors can generate more equity and value compared to simply adding an ADU.

I have a team that manages our ads getting $15-20 leads nationwide wondering if AI is beating that.