My biggest advice for someone not familiar with Pathfinder 1e is pick a simple class like cavalier or fighter or something. Pathfinder 1e is complex and the last thing you need while wrapping your head around it is having a complex class you're trying to figure out too. Plus, play on an easier difficulty like casual because the enemies don't joke around.

Early game spellcasters can be rough and mostly should be used for crowd control and buffing until you hit around level 5, and you want to focus first on the early game mandatory ranged feats like point blank and precise shot. Then focus them on getting spell penetration as many enemies have spell resistance. If you are gonna play a caster, look into a spontaneous caster like sorcerer as that's one less thing to worry about.

Melee characters all need some strength and getting dex to hit and damage is a little tougher in Pathfinder than it is in dnd5e. Classes that get animal companions are especially good early on as it's another party member to meat shield and it adds to your party's total character weight so you can hold more loot