Not the original commenter, but I can give you a little info. For resources, the main source is https://2e.aonprd.com/ it’s the official SRD, for free. All non-AP materials are released there, so for character creation and running your own campaign it’ll have almost everything you need. I haven’t had the chance to play myself yet, my group is at the end stages of a 5e campaign, so I can’t offer much from a players perspective for switching systems, but I hope that link helps you!

Definitely feel free to ask away. Like @dylan said, everything is free online from Paizo except the APs and artwork basically. So all the rules are readily available on https://2e.aonprd.com and elsewhere. Pathbuilder is a great resource for building your characters, though it saves locally so back up or you’ll lose it when you close your browser.

Additionally, I highly recommend the beginner box. It’s only level 1-2 and can be played in 2-3 sessions, so not much of a commitment. But it does introduce you and the player’s slowly to the rules and whatnot, while still being a challenge. Most people then transition to the Abomination Vaults (what we did) because it’s located in the same town, so there’s already familiarity. But even if you decide to homebrew or do a different path, I’d still recommend starting with the Beginner’s Box.

Another tip, especially coming from 5e is don’t go changing rules that seem like they don’t make sense to you. At least without playing for a while. It’s a common thing to do with a 5e mindset, but while they’re similar, they’re different enough that you should get used to the game before tinkering.

Sadly, Reddit was a good place to find info, but well…