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!