Instructions
Enter Stormwind City. If you're still in Elwynn Forest, Stormwind City lies at the northwestern tip of the zone. Once inside, exit the trade district through the eastern exit, and then cross the bridge in the Canals.
Turn left after crossing the bridge and continue on the path until you come to another bridge. Cross it, and then turn right. The Dwarven District will appear on your left. Enter the Dwarven District and take the first right into the tram. Board the tram and ride it to Ironforge.
Jump off the tram at Ironforge and turn left once you enter Tinker Town. Continue through the Military Ward and into the Commons. Exit the commons to the south to enter Dun Morogh. Take the road from just outside Ironforge to the bottom of the cliff, and then take the road on your left.
Follow that road all the way until it forks to the left and right. Turn right. Go through the South Pass and you will enter Lock Modan.