First item is a bit of house-keeping, your entity and taxation structure is a bit of a mess and you need to address that to best position for moving forward. 

:- purchase rules regarding foreigners purchasing U.S. turn-key rentals- U.S. tax rules foreigners need to follow ( filling, tax withholding, double taxation, etc..)Thanks in advance!

Often times, that may be somebody who is a specialist in this area of taxation who can serve you virtually, rather than somebody in your geographic location.Best of luck!

***My expertise is in public/private auditing and not taxation***6) I am considering developing an LLC.

@Basit Siddiqi What's the advantage of taking S-corp taxation then, if you're an LLC?

I would prioritize finding an accountant who specializes in real estate taxation over one that is local.There are 20+ accountants on this message board who specialize in real estate taxation.

As others have pointed out, you likely need a CPA instead of a financial advisor.When selecting your CPA, make sure they are familiar with real estate taxation(Especially as it involved short term rentals).

Rent doesn’t necessarily need to be paid, and it would be a double taxation issue, but a contract outlining the arrangement signed by all members would certainly be helpful.

An LLC also offers flexibility in management, taxation, and other aspects of running a business.

Sales taxes for the state are comparatively low at 6.25% (it can reach a maximum limit of 8.25%), and Texas is one of nine states that does not have personal income taxes.However, as taxation is a vital source of revenue for local government, the burden falls squarely on property taxation to compensate for the lack of other revenue.