I would personally recommend you start over at level 1, and discard any notions of how things might work that you carry over from other systems (even besides 5e).
In general for TTRPGs in the larger sphere, every system is its own thing, and looking at rules with fresh eyes and no preconceived notions of how it might work tends to help interpret and understand them better without tripping yourself up on what you thought they might be.
The rules are legally free and you can check them out in places like the Second Edition section of Archives of Nethys and PF2eTools (if that name sounds familiar and you have concerns, worry not! They have contact with Paizo to keep them in the clear and avoid content that doesn't fall under the free use rules, and were even present at PaizoCon 2023!).
If you want an excellent tutorial to get started, the Beginner Box is great at teaching as you go. Hope you enjoy the system!
Half-shameful plug for my own at Transient Thoughts on Roleplaying Games. I just recently started it so I only have an article as of yet, but you're welcome to check it out if you find it interesting.