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Horde guide:

http://forum.warmane.com/showthread.php?t=276299

Btw I leveled on my own way and didn't read these guides, so I can't say, if they are the best way/all correct

The guide one...

Not all bugs are bad ingame: There are some really nice of them in mop, so you can level from 85/86--90 really fast.

Here is a guide, that I casually found once after watching whole forum:
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