Good lucy with your decision. From a work point of view it could be the best move you ever made, especially considering how senior you are. I have a friend who is a NUM and a friend who is about to start a masters to be a nurse practitioner, both get paid more and better work conditions than they had in UK. You need to get national registration from AHPRA (ahpra.com.au) and can contact hospitals you are interested in to see if they will sponsor you.
I am in Sydney, very expensive, $650 for 2 bed flat, 3 kids, not exactly a dream for family life, but no regrets. Sydney is very expensive, we were comfortable in Norway, but really struggle here, partly due to bonus baby though.
I have little kids so different worries like expensive childcare, but teen present different issues, such a schooling, on a 457 visa you pay for public (state) school, but most people here talk about private high school, expensive and on lists from when little. Also thinking ahead about university is a factor. Also if they made need braces etc etc, can be very expensive.
Also if you have family and a good network of friends, it is hard to start from scratch in a new country.
We will go back (my issue is UK or Norway) as it is so far away. Very expensive, yes, paradise, no, but an amazing life experience however it pans out :)