The primary stat you will want to focus on while wow powerleveling is intellect, the more mana you have the more mobs you can kill before drinking. Spell power is also a useful stat while wow powerleveling, but there isn't a whole lot of it available until you reach Outland, so focus more on stamina as your secondary priority until you reach Outland. Spirit can also be useful while wow powerleveling because it will help regenerate your mana between pulls, or while casting if you use Mage Armor or have Arcane Meditation, but do not make it a priority over intellect.

 

To use a wand open your character pane (default shortcut key is 'c') and drag the wand from your inventory to the ranged slot, then open your spell book (default key is 'p'), click the general tab, and drag the “shoot” ability from the spell book onto your action bar. You will now be able to click that action bar icon to use your wand attack. More on UI set up later.

 

If a quest is too hard don't be afraid to skip it completely or save it for later. The easiest way to level is to simply complete quests about your wow powerleveling. The best questing strategy is to accept every quest from an area, complete as many as you can, turn them all in at once, then repeat until you have completed all the quests that you can from that area before moving onto the next area.