Once your in TS head to the Docks. (if you don't know where they are, follow the road, and take your second left(first left is near the undead farmers), just after the road starts to go right). Once you are on the docks, look for the mariners bell to Nektulos Forest, and take it. This will take you to nektulos of course.
Once in Nektulos you can follow the road out, and head right, this should get you to a bridge, where you can then take a tunnel that will zone you to the commonlands... easy way to get there though is to have a lvl 25 scout of some sort grouped with you at the Docks and use "escape" this will zone your group over to the Commonlands zone in automatically.
Hope that helps a bit. Been a while since I've taken the route so I apologize for being vauge, that should get you there, or at very least close.