The lot is overgrown at the moment so clean it up and then start with two buildings on one end (30'x300') and covered parking on the other side.

It sounds like you're in a pivotal moment with a lot of moving parts—seller financing coming due, repairs needed, siblings renting from you, and a move to a new state.

Honestly, the proper strategy at this moment would depend on a few factors that would be a bit difficult to get into on this board.

I have posted my property without pets at the moment.

What I mean by that is, your goals starting out are kind of meaningless because you have yet to live in the moment of achievement.

Is there value in networking here, knowing that I'm really looking out of state at the moment?

On another note, the Property Management agreement does not transfer; it will end at the moment of the recording (sale). 

The property looked like a goldmine on paper, but the moment the first tenant skipped out on rent, everything started falling apart.

If you want to worry about things, you should be aware that asteroid may hit the earth at any moment and destroy all life.

Now with scope creep anytime you open a wall expect its going to cost more. if you are doing paint and carpet that is one thing but the moment you start renovating bathrooms etc. expect the cost to increase as you do not know what is behind those walls.