Nostalrius Begins - Quality wow vanilla realm (1.12)

I'm planning to level up as a shadow priest, but i want to be able to heal in dungeons. I'm wondering if I should have more than one gear set with different stats, one for leveling and one for healing in dungeons? If I should, which stats should each gear set focus on?

For 5-mans gear with int, +healing and some stamina on at least a few slots is in my opinion preferable.

You generally dont have to switch out your entire gear, but optimize where you can.

Trying to maintain two sets while leveling isn't really worth it. If you can find some pieces with +healing, you can hang onto those for dungeons, but otherwise your regular int gear should be good enough.

It's not really worth it, just stack intel+spirit with the occasional +spell dmg and healing gear you find like you would do anyways and you'll be fine.