How did you come up with those markets and have you visited (or lived in) any of them?

I grew up in Columbus, however I have not lived there in years but I visit often.

Her and her husband would live in one unit and the other three units would be rented out. 

The biggest advice I can give you is to figure out your own goals, and be specific, so I want to invest in multi family for cash flow for instance is too broad, is your goal to have an investment or a place you enjoy living, those are often in conflict as most multi family tends not to be in the most desirable parts of towns, are you willing to high cash flow in exchange for alot more effort, risk and limited appreciation, or do you want a more stable property with potentially less or even zero cash flow, if it’s a primary residence, are you going to live there long enough to make it more sense than renting, the breakeven period in a place like Baltimore might be 3-5 years.

I don't mind moving here and house hacking, I currently rent and actually really enjoy the area from what I've seen, so that is definately an option.

The plan is to rent out the top unit to a long term tenant and for us to live in the middle unit until we move out (if we ever do). 

I am living proof.

Also, is the "service date" strictly the date the property was brought into a serviceable state, or the date the listing goes live? 

Biggest thing to remember when searching for a mentor is to add value to their lives or business.

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