It’s like this:
As a spellcaster, one of your attributes is your primary, and determines the highest level spell you can cast and how hard they are for enemies to resist. Your score - 10 is the highest level spell you can cast, so for 9th level spells (the highest) you need a primary score of 19 (you can increase scores as you gain levels). Clerics use Wisdom as primary. Constitution gets you more hitpoints, Charisma lets you turn undead more effectively, Strength lets you hit harder with melee weapons and wear heavy armor without being overburdened. Dexterity and Intelligence are less important (attributes you don’t need as much are known as “dump stats”).
On the other hand, maybe you want to make a weird character who doesn’t play to type so much. I like that sort of thing - in another game, I’m playing a monk with low Wis and high Cha (the reverse of normal) so that he can do some funky sorcerer multiclassing. But that gets more complicated, so you may want to stick to basics for now.