Without wishing to be a smart a**** I would recommend starting at the very beginning.
The OP gives a good summation of what is trying to be achieved and the basics of how one does it. When I started there was only about 170 pages and, over a few days, I read through the lot. If for no other reason it means that the questions that you subsequently ask are informed.
People on the forum are incredibly helpful (at least that’s what I found) but part of the reason the thread is so long is because the same questions get asked over and over again; and there is, rightly, some frustration with that and people’s desire for an instant fix. There’s many people on this thread that have expended huge time & effort to achieve an outcome, are more than happy to share their experience (I am a happy beneficiary of their knowledge) but do expect a little effort on your part.
In summary you need an Australian Amex, a US phone number, a US postal address and to engage in the Amex Global Transfer process. You also need time & patience. But it is essential that you do the homework.