Currently my mage is lvl 35 with some gear in the low 20s.
The lower lvl gear I have, got Frost Spell Damage.
To my understanding Spell Damage is more important than Int and Spirit by a lot.
However my stamina is very low, should I not focus on stacking Spell Damage until in +50s?
It depends on how you plan to level.
Gear is irrelevant when you get boosted.
If you want to AOE grind yourself / boost yourself then you don’t need spellpower.
If you want to grind single targets then spellpower will make your spells more mana efficient…