Additionally, I would absolutely connect with a wholesaler.

Recently I helped my landlord by doing a simple kitchen and bath reno which has now helped him cashflow an additional $200/ mo. 

(credit cards, cash, additional borrowed capital)-What are the biggest mistakes you made when starting off in the fix & flip arena?

The realtor's communication with this tenant does not seem to be helping. 2) If she actually moved in, it is 95% likely she may have additional tenant protections due to her age and medical condition.

Also in addition to vetting a deal sponsor, take an alternative route and ask that are currently equity partners in someone else's deals as to what their experiences have been so far.

The additional numbers and info you provided look good if it all goes to plan.

While the interest rate and terms of the loan (including amortization schedule) are critical, these are other small things to consider.

It's 2 bed/1 bath each, and it's on a 10,000+ square foot lot with parking for 4 cars (two garage, two additional off-street). 

There's a lot of value add here, in addition to what's already there.  

Aggressively paying down the mortgage by supplementing the 500$ in cash flow with an additional $1,000 in personal income we would pay the mortgage of in approx. 10 years and save more than 120K in interest payments.