I’m level 70 in my first play through ever of WoW. New to MMO’s in general. Advice for the game or thoughts on the mog ?

I did the campaign quests until level 70, but today I’ve just been hunting rares down bc I killed one and it gave me a really good staff ( for my level I suppose ) so I took a break from campaigning to try and milk those but tbh Idk what I’m doing. I want to finish the campaign, get ready for open world pvp if it’s there, and look fly. Not necessarily in that order lol any tips would be greatly appreciated bc I spend a lot of time just flying around deciding what’s worth doing 😂