Finally I came to my senses and served them a 'Notice to pay rent or vacate by the 10th of January' after which I plan to file an eviction.

The numbers have to work for your business plan or you will end up with a money pit.

Our initial plan is to house hack a quadplex somewhere in Orange County.

In this manual (which I assume could be modified to provide to tenants) I include all the financing information (which you would not include for tenants) bank accounts, mortgage accounts, payment information, and mortgage payoff), a list of the contractors, what each contractor does, a list of upcoming planned or necessary repairs, and a copy of all leases associated with the property.

I'm looking to having my mortgages paid off as I plan on early retirement and the rentals are part of my retirement income.  

He knows we plan on continuing to grow our portfolio.

I will suggest you plan to House Hack a Duplex or Triplex or Fourplex every year for the next 4 to 5 years and you will thank me later.Goodluck man and keep us posted on your progress!

Should I spend money on professional photos?

Little to no rehab/capex spending was needed.

Who wants to spend $100 to view a rental?