[drywall]), insulation (more bat in the cavity but not too much where you mess up the 3rd factor , decoupling: resilient channels and double stud walls are for this, The 4th item is sealing openings and penetrationsThere a lot of different levels and it comes down to is this going to be a separate unit or just a finished basement.

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I've listed below the order I plan to attack things in, let me know if this sequence makes sense:Resolve excess moisture under house (minor grading issue, gutter required, possible plumbing leak)Repair minor roof leaks (repair flashing, seal leaks around chimney, replace tree-damaged shingles)Trim trees away from houseInstall 50 concrete piers and level foundation (foundation had work done previously but shifter due to excess moisture)Install vapor barrierAdd structural roof support beams in attic, add insulationRepair rotten siding/soffit/window frames (mostly upstairs)Repair porch (replace rotten boards, sand & paint)Paint exteriorInstall central AC/Mini-split system (any recommendations on this?)

The window seal top to bottom is completely rotted out because of drywall mold and the window must be torn out.

A professional is going to know the appropriate products to use and will advise you on preventive measures like making sure holes, cracks and entry points are sealed. 

New paint, vanity, windows, and a "coat of seal" on the roof. 

Question: I have been doing remodeling to my home since I purchased it in 2010- made my living room and kitchen area more "open concept" and have exposed concrete flooring which I want to stain and seal.

Many have been sitting vacant for months and all it takes is a 25 cent rubber seal to crack and it will fail a pressure testAnother potential issue.... are you getting a loan ? 

What about maybe sealing the vent system in the restroom sounds like its seeping thru there, or maybe a wall you can build that divides the restroomsIn the attic.

If you can afford it a large down payment of 20% or more will make your purchase a sealed deal.