If you bought the version with the PS5 entitlement...When you hit options there's an option for the PS5 full download (after installing the PS4 version from the disc and redeeming PS5 code in the box). Select that and it will upgrade to the PS5 version. Start the game, select the style and your skill level. You'll have the option to go through tutorials (or not) while the rest of the game downloads.
Be sure to click on your profile and accept the terms of fair play and then all of your preorder goodies will show up.
Hope that helps.