Get your financing figured out so you can submit an approval loan letter with your offers just make sure they include how long it will take to close and the maximum amount you qualified for.Do not try to do everything yourself.  

I have done this in the past and the tenant seemed to be more responsive to all  my emails when I included the co-signer as well. 

Don't use any automated ways to determine values, that includes Zestimate, Redfin estimate, or any other tool to claim to values in an automated way.

All income (including w-2s) and all debts.

I'm still in the learning phase so I have to explore all my options including those I don't yet know about. 

The current owner is literally MIA and does not respond to any requests for anything from anyone including his own lender.  

This includes an upfront insurance premium of 1.75% of the borrowed amount.

There are a few MF for sale currently including a large complex for 6M.

This includes a mother in law apartments. 

Half a year later, here I am introducing myself to you all after having read more books than my previous fifteen years put together and devouring every resource I can find, including no less than half of the BP podcasts (almost all played at 1.5x speed; thanks for that epic Quick Tip @Joshua Dorkin and @Brandon Turner).