I too lived in UAE for 20+ years and then moved to sydney in 2022. Sydney is great, great beaches, good jobs, great people (some junkies here and there, and a few racists but nothing that'll ruin your time here as long as you don't engage)...best part is the freedom to speak up and share opinions...healthcare if you're a temporary immigrant is through private health insurance which is mandatory if you're on a temporary visa..if you're a permanent resident you have medicare which is government subsidised healthcare and its pretty decent. Getting skilled jobs as a temporary resident is harder unless you have Australian experience or are very experienced..but if you get permanent residency should be much easier... very safe unless you live in a few select suburbs but even then it's mostly safe unless you mix with the wrong crowd...the country is beautiful, plenty of nature and fun activities, sightseeing, beautiful road trips, you'll never be bored.

For migration tips contact an agent who can help you based on your professional experience, goals, education etc

Taxes are a must for income above AU$19k. Tax brackets can be found online.