I guess a better question might be (without getting too personal about my credit score), what is a minimum or appropriate score to have for refinance in order to not get laughed out of the office of your local community bank lol

I have taken in everything you said and will take the appropriate steps and measure in the future.

You may also want to have environmental specialists to do inspections and appropriate remediation.

Set yourself up for success with appropriate systems, and when a hole is discovered, plug it!

I'm wondering if I can set it up so that I can easily track expenses, debt payments, etc. for both properties, but have them applied to the appropriate property so that I can easily see how each property is doing.

You want to rent out a single family room by room, just add the appropriate locks to the doors like any rental requires. 

And what would the appropriate percentage be?

If there is an expense payment required - you would typically submit appropriate form to the custodian, wait for them to approve it and then they will generate the check from your IRA account and send it to the payee according to your instructions.If you don't want to deal with the "middleman" (the custodian) for each transaction you can bypass the custodian by using Checkbook IRA (aka IRA owned LLC).

Is it appropriate to ask if the tenant has had any prior evictions before the viewing?

If they are asking about an emotional support animal, then they have been diagnosed with a mental condition by a licensed psychologist or psychiatrist...from your state, and can supply the appropriate letter of diagnosis.