Pretty simple trick, might even call it common knowledge, but for those who doesent know this i guess ill just post it anyways:
at lvl 40 you can obtain combustion if your fire specced as a mage, so basicly what you do is you go to one of the high level target dummys, pop combustion and start spamming whatever spell you wish, your combustion will reach 10 stacks as the high level dummys are pretty much impossible to hit for you. This is pretty good for bgs or whatever, starting off with 100% crit on some abilitys can help quite a bit.
[img=http://img136.imageshack.us/img136/8445/wowscrnshot120508145328wx1.th.jpg]
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