Choose wisely, be professional, have company policies that you stick to.  

Legalities depend on the letter of the law.

I have been able to save 5-20% more of my income per month than I normally do (depending on the country), and Argentina is the cheapest country we've been to yet! 

Depends if you hired them through your business or if you just simply purchased their services.

Which is best for you will depend on the nature and scale of investments you intend to make, as well as your risk tolerance.Bottom line is to speak not only with a plan provider, but also with qualified tax or legal counsel.

All depends on your budget.  

They may be able to give you an idea of what the costs are in the area to move a mobile home (depending on its size), location and other fees involved (i.e. utility hooks ups, permits, etc). 

Depending on the neighborhood and how you design and market your property, will depend on the STR revenue.

I think a lot of it will depend on your personal tolerances. 

There is also a VERY ROUGH estimate of $20-80 per sq ft depending on what the house needs and what finishes you choose.