I understand that the "gold standard" is to ensure every contractor has liability and worker's comp insurance and that I have renovator's insurance on the rehab property.

Yes, there is work to be done to ensure the income continues, but I treat my investment as a business I run--NOT a passive investment.  

I will ensure that I touch base with other professionals along the way, to get a better understanding.

If I'm being completely honest though, your use of it does seem a bit hypocritical given repeated statements you've made about how spending money with Zillow is funding our success, and helping ensure real estate's demise.You're a smart guy Dave, and a savvy business person.

That's Chrome being overcautious (cloudflare is what we use to ensure the bad guys aren't hacking BP), but we don't want people to see this message.  

My goal is to determine a maximum home price that will cash flow given an area's rental prices.I just want to ensure my credit card use does not harm my score.

Any advise on what terms we should add to the lease to ensure both parties are fair?

If they come through anything else then I will have them complete our standard application process and ensure that they don't have a history of hoodwinking or anything like that.

Aside from ensuring the house is clean, would sealing these areas be a good place to start?

It was totally worth my time and the agency certainly put forth plenty of effort on my behalf to ensure that I had the knowlege and support to make a decision.If I had tried to "do it myself", I doubt I would have ever made a decsion.