I would rather use my knowledge than my wallet when buying assets.# 2.

For smaller vanities it's usually best to just replace the whole vanity-if toilet shows scum or the lid shows any form of wear replace it-replace any mirrors or their hardware that do not look brand new-be sure all windows function-be sure all external doors are keyed the same-new white vinyl cordless blinds throughout The list is usually longer for complete rehabs, but hopefully you get the point.

All-in-all, I have been reading/listening to bigger pockets for years now so I suppose it is about time for me to open up my wallet.

You're looking at trim, hardware and the door itself. 

Besides the bad back, every time we need something, we had to run to the local hardware store.

@Don Meinke also raises many good points, in particular the FPE breaker box, lead paint, and outside receptacles.You can do a simple test for lead paint yourself with some 3M "Lead Check" swabs from the hardware store. 

If the cabinets are in good shape under the grime, give them a really good cleaning and then have the doors sprayed the colour of your choice to freshen them up and add new hardware. 

After the patching I just have to finish painting and putting on some new doors/hardware and it should be ready to rent.

In the living area we updated the flooring, painted the door and updated the hardware, changed out the trim to a wider white trim and painted the fireplace mantle.

@Donte HandyAt less than $50 per set, The Kwikset Smart Keyis a good investment. https://www.homedepot.com/b/Hardware-Door-Hardware-Door-Knobs/Kwikset-SmartKey/N-5yc1vZc27lZ1z0v4pb