Some people just want to kill and grind without bothering to do quests. But I disagree. I believe that quests are an important component of wow powerleveling as they give additional EXP, money, and items. BigDwarf starts the game in Dun Morogh, near an icy field full of lvl 1-3 wolves and such. He immediately runs to the field and starts hammering wolves. He gets to level 3 fast enough, in about 40 minutes, after killing dozens of wolves. He then starts talking to the NPC's nearby that have Yellow "!" (exclamation marks) on top of their heads (a yellow ! means the NPC has a quest for you)

 

Grinding is always good, but the benefits of questing is that you get additional exp for finishing a quest for wow powerleveling, and cash or valued items. Had BigDwarf taken the quest at the start, he would have greatly increased the efficiency of his character gains and would have the quest completed! So BigDwarf talks to an NPC who gives him a quest to kill 15 wolves, and when he does he get extra exp and extra copper. The problem is, of course, that now BigDwarf has to go back to the fields and kill wolves again.

 

This principle becomes more profound the more you advance in levels. Numerous times I found myself accepting a quest to kill "10 of X monster" that I had already killed 20 of! Learn this lesson now, or waste numerous hours to learn it the hard way. In fact, this is certainly what I would call a key to the game.