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For camping bring a tent or if it's always warm enough a swag as the Aussies like it, sleeping bag + mat of sorts, small inflatable pillow is kino (neck pain is a cunt when riding), multi tool, lighter.
As for gear you can go full boomer and gear up like you're going to ride the Dakar. Or just get a jacket and replace the stock back padding with a back protector, riding pants that don't sag, boots up to your shins, enduro style helmet with high and wide visor + sun visor + peak is kino. Earplugs.
Figure out how you wan't to chuck it all on the bike, the lighter the better. Top case will make you more top heavy but narrow (plastic is ok), side cases offer more space and keep weight low but make you wide and can break with multiple or a single fall but easier to pick up bike (plastic not ok). Softbags also an option but stay away from innercities then. Tankbag is kino.
Don't overthink it and just get it done with the budget that works for you. There will be a lot of improvising along the way and only through doing will you learn your preferences. Enjoy one the last bastions of the faustian spirit that offroad riding has to offer, you won't regret it.