If you're not playing AH.
If you're horde, picking up herbalism as your second profession.
Once you have high enough level, go to Duskwood, Raven Hill Cemetary has a whole heap of Grave Moss which sells nicely. (not to mention the bonus swiftthistle)
When you've picked all the moss, go to Westfall and kill the Dust Devils, they have a chance to drop Magic Dust, which is hard to farm / obtain as Horde and can sell as high as 20g a pop on some servers.
This is what I did on my twink, managed to get some world PvP fix in there too.