And in terms of items, do you think i'm doing okay or not?
Any tips for leveling up faster btw?
Leveling just focus on weapon DPS, vit, int. Don't worry about anything else. Throw a Ruby gem (%xp) in your helm (highest one you can craft/afford) to help increase XP gain. And with the MP XP changes always play in a party. The increase XP helps out alot. Just play the wiz like a melee toon. It's how I leveled my Wizard.
When you get to hell, pick up a few pieces of gear with ALL resist on it and/or switch to energy armor to help stay alive, if you need it.