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

However, I do know septic inspections and repairs are more documented and regulated. 

Contracts, financials, and supporting documents are the backbone of the process, and missing even one can lead to delays or worse.Third-party inspections—like surveys, appraisals, and engineering reports are also key.

Yes, in theory those would be more expensive, but if I'm one of the first to buy and two years goes by and I need to sell, I'm now competing against brand news homes in my development.

Not just in the setup, initially, but separate bank accounts and properly signing all documents as a member of the LLC, even if you post on your personal social media accounts about a property owned by the LLC, if someone sues you, they will try to use all of that to get to you personally.  

Anytime the media spits out news coverage on rates, it has already been baked into the market from Wall St.

, my ID and documentation that shows that I am the owner of the property such as a closing statement.I called again this morning, Monday, only to be transferred to voicemail, so it looks like customer service for when your account is locked in non existent.

Of course, with all things, the situation varies and no one on these forums has seen your underlying documents and the actual terms, and thus, you should consult with legal counsel specific to your situation. 

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

Quote from @Marcus Morin: I hate being the bearer of bad news, but you must watch this one carefully.