The only information I had to go on was with the last Lender informed me so maybe it was specific to the company they were with.

I'm not an attorney or expert in AP specifically, but do have a working knowledge of it for Civil engineering/survey work and have had two projects where this came up and I was able to 'ride along' and see how it unfolded.First, if you 'know' the property has been taken by AP then there's nothing for you to do with the tax assessor etc.

For example, are there specific documents or information I should prepare, or would identifying a target property first be more beneficial?

I'm planning to send some mailers this year using the Ballpoint Marketing integration, so really glad to see you guys have added that!

The scope of what you asked covers a broad area from estate planning, to tax planning and forward. 

I would also add that you join your local REIA chapter (Real Estate Investor Association) as it will allow you to network with other STR owners and get more location-specific information. 

Call the zoning department again, and this time ask specific questions: Is a variance required, or can you proceed as-is?

Consult you insurance broker for specifics but I found this policy to be very protective and reasonably priced.With regards to an umbrella policy they are typically good to have.  

For a yearly lease agreement specific to Phoenix, AZ, you might consider starting with the Arizona Association of REALTORS® (AAR) or another local real estate organization.

If you plan to manage remotely, then find a good PM or have a trusted team that can inspect your property regularly - and be ready to pay them.