Looking to get started in this game. Any constructive tips or things I should know. Want to start WW Barb I'm thinking...

Played Diablo 4 since launch a couple thousand hours. I like Sorcerer/Wizard but Barb is nice as well. How diverse are the builds here? When's the season end/ start? Do I need a build guide? Where do you look for build info? D4 has websites but I'm not seeing that for this.