I prefer to fly to Aus with a couple of hours connection time in the Middle East. I used to fly with Emirates but in recent years I've switched to Qatar. I choose a morning flight from London to Doha and eat/drink etc as normal (including a glass or 3 of wine), get to Doha and have a stroll round the airport and shops and a shower and some snacks / juice in the lounge. Then on the flight from Doha to Australia I have a meal and watch a movie and then sleep for the rest of the flight. I take melatonin (10mg) each night in Aus for the first 2 nights and after that I'm completely on Aus time without any jetlag.
When flying I always take a Drowsy silk eye mask, a pashmina (cashmere on one side, silk on the other), my own travel feather pillow with silk pillowcase, Bottega Veneta slippers to wear on the flight, Bose noise-cancelling headphones, a water bottle, facial mist, eye cream, lip balm, hand cream, dry shampoo (helps style my hair before landing), deodorant, perfume and face powder. Plus battery pack, plug adaptor (and charger for my phone and Apple watch), Kindle Paperwhite and iPad (with lots of TV/films preloaded - just in case the IFE isn't working). And some mints plus toothbrush and toothpaste (I hate having dirty teeth on the plane - feel so much better after brushing my teeth!)
I travel a lot (used to travel long haul with work frequently) so I'm a bit of an old pro who keeps a travel bag ready prepared.
Don't forget to include an Air Tag in each of your bags so you can keep an eye on where they are (stops you worrying when you're waiting for bags to come out as at least you can check they made it to the same country before you actually see them).