My questions are around taxation - i have read that if the rental is not associated with a us trade or business, then the gross income from the rental is taxed at 30%, however if associated with a us trade or business, then graduated rates apply, as well as the net is taxed and not the gross.

With high interest rates, we'd be looking at around $3800 PITI.

Cooper) said that the mortgage is assumable (there is path that would allow me to remove spouse from mortgage and retain the current rate), but the process can take a while, is subject to fees, and they need to reevaluate my ability to qualify for the mortgage without my spouse.

Angelica - I agree with Brendan, The best way to find contractors, agents, etc.. is through a local meet up.

Super Jumbo mortgage loans and lenders can vary widely in their rates and qualifications. 

Communities like these are terrific, but I feel getting out and actually meeting and getting to talk to other passionate people in real estate would help immensely.

Is there any other qualifications required to meet? 

Are online webinars as good as in person meeting? 

Our initial idea was to build-to-rent two 1,300 sqft homes on the additional tracts of land, but after speaking with lenders, the current interest rates made this unfeasible.

Some renovations loans out there but the rates and prepays can be painful.