It was all great until Google Wallet said I was using it for business purposes and shut down my whole Google Payments account, which meant Google Docs and Google Pay were suspended.    

@Ty Gast , the docs are sent as a PDF on purpose, so no changes can be made.

This is best done by comparing what other homes have Sold For in the general vicinity of the property.

With the new tax laws, is it better to form a S-Corp for tax benefits vs. using an LLC?

Might talk to local property managers to see what they say.I personally wouldn't use a live-in property manager for a multi this small, just doesn't make financial sense compared to paying 8-10% for an outside manager.

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

You can also take a loan from the 401(k)As @Sean Carroll mentioned if you were buying real estate for investment purposes only (not to live in personally) there are self directed retirement accounts that allow you to invest in real estate to grow your retirement wealth.

I do recommend to use inspection, especially since I am abroad investor.In addition, the inspection report help me to make sure the contractor quote covered all major issues, and I also use the inspector to visit during the rehab to make sure the contractor finished each construction stage.Investing ~$250 in inspection in compare to the money you invest in buying and rehabbing is not major and reduce your risk.Good luck.

So just keep copies of the receipts and a running total so you know your basis for any eventual sale purposes. 

SFHs, not being purpose built rentals, can easily be sold without any negative consequences.