One thing I'd assume you probably already know is definitely don't worry about your gear too much until you get to maps which are the main "endgame" content since you'll be changing out gear alot before than. Uniques are a huge part of the game too, they can completely change the way you play builds

I haven't played poe in a while and haven't looked too much into poe2 yet but I would definitely suggest looking into the skill tree a bit cuz it is massive. They are also changing alot of stuff compared to poe1 like the way skills/sockets work so builds are gonna be very different most likely

Can't wait to watch you play some POE2, I plan on getting back into poe when it comes out and will be great to see creators I follow which that kinda content isn't their main thing, getting into it