Yeah, I saw a PF1 character sheet for a level one Wizard from someone's SI fic, and it looked more complicated than most entire rulebooks. There's a reason I think PF2 is probably worth learning - I just wish there was an obvious 'start reading here' link on the website, and that following that chain would reliably get me decent mastery of the system.
Perhaps you are looking for the
Character Creation Rules.
Or, adjacent, the rules for
Leveling Up.
As you can see, that overlaps with what a class - e.g.
Fighter - lists at level 1. You pick an Ancestry and Background, which together with your Class determine your HP and your Ability Scores, as well as some of your starting feats (you get an Ancestry feat and Backgrounds do typically come with skill feats).
You then get a bunch of class feats, which for the non-spellcasters will include a 1st-level class feat.
Presto, your character is done.
To level up, go up each level and pick what each level offers you. The class table lists it all and the page explains it all. Your proficiency bonus will just end up being whatever proficiency you have (+2 for trained, +4 for expert, +6 for master, +8 for legendary) plus your level (+0 overall if you are untrained because you're not proficient, duh).
It's a fair number of choices to make, but keep in mind that
Retraining is a core downtime activity - it generally takes a week of downtime (and no cost other than opportunity cost) to change a choice made. So you can feel comfortable to just try things out, or change up your build at higher levels, even if your GM isn't generous there (unless you get no Downtime, though that'd be an atypical campaign).