You should bifurcate the total interest of the cash out and put some towards the rentals and the appropriate amount towards your personal residence. 

For 1950s houses in the one package, I have a hard time believing total expenses are 35% of rents.

This cannot be decided without a total picture of both the duplex finances and your finances as individuals. 

I'm betting it's not this guy!

The replacement cost of the breaker panel was $1800 for a total of $2500 due to lack of knowledge on this topic.

Total newbie question...

If they totally screw it up, you may lose a little money, but you won't be one of the horror stories on here where a contractor has an entire house torn apart and isn't getting anything done.

I quickly plugged some numbers in and it looks like you would be cash flowing $1000+ total,  after including maintenance, capex, property management etc. 

So for a 2-story house with a basement unit (combined for a total of 2 units) with a market value of $550,000 that also has 6 parking spots, 3 indoor and 3 outdoor I should be able to collect a total of $5,500 monthly rent? 

-only debt: $100/mo for student loan-credit score falls within the excellent range-~28k total to put into a deal, leaving 8k for family emergencies