You need to take the boat from the south facing dock in Auberdine. Then follow the road through the Wetlands(good luck!! and watch out for the crocs. Mean Suckers depending on your level) then just keep on trucking til you get to Ironforge. I would tell you the areas you run through if i could remember which came first, Dun Morogh or Loch Modan.
Once you get to Ironforge, find the Griffon Master and then you won't have to make the run any more and can instead pay the 3s to fly over the mountain instead of having to run around it.
I am sure someone can give you better directions then this, but at least its a start.