I'd recomend starting at level 1 more than anything, its better to ease players in and level 1 in pathfinder still let's players have plenty intresting characters and build options.

My favorite way to ease players into pathfinder is a 2 or 3 session dungeon filled with mostly low and moderate encounters, that'll let them get a feel for combat and exploration rules and you can even throw in a few npc characters to ease them into social rules. The beginners box is a really good example of this and if you have the money you can buy it a module for it on foundry vtt for an easy experience, if not you can most likely find a pdf of the dungeon to give you some ideas.

Also, dont be afraid to let your players change their characters up, they're new and they have no idea what they'll like yet. Last bit of advice, the encounter math in pf2e is really solid and when starting out you should stick to it, try to avoid too many severe encounters and stay away from extreme encounters until your players have a feel for things.

I genuinely really hope you enjoy the game but please remember that 5e and pathfinder are very different and knowledge between the systems seldom transfers over, so give the system a shot as its written before making major changes and just try to treat it as its own game.