1. Roll a Mage.
2. Get to level 26.
3. Start Cone of Colding your little heart out.

Why?

You're training yourself to use Shockwave. I think we can all agree, warriors are going to be using Shockwave, a lot. You may not realize though that using a cone style aoe move isn't necessarily as easy as it sounds.

Practice makes perfect. Hop to it!