We also have a team of VAs assisting the leadership team and tracking KPIs so we know if any location is faltering and needs attention. 

I've been self-employed for only 6 months, and loans are proving difficult to come by despite my great credit (not to brag, I'm moreso frustrated and seeking help).

Products & Services enable us to track each 'phase' of the rehab.

Thats your bonafides to being able to do future deals.As mentioned above, keep your credit perfect.

Another possibility could be a home equity line of credit (HELOC), if you have sufficient equity in another propertyGood luck with your project!

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

To add-on to what @Russell Brazil detailed, there is some important life changes that can fast-track things. 

For now, my immediate goal is to pay off all of my credit card debt (should be accomplished by February 1.), and continue to educate myself on NOI, Cap rate, cash-on -cash return etc.BP community, I am open-minded, willing to take initiative, always willing to be taught something new, but also ready to share any experience or knowledge I have that can help someone else. 

Compared to other services that might offer lower-quality leads or require higher upfront costs/paywalls, Prime Tracers also give you free lead credits on sign up so you can actually see the results before you commit to a purchase.

Renting it out while strategically leveraging the equity could be the best path forward.As @Jaycee Greene said, DSCR looks at your credit rather than DTI.