The Port Auley Trade Post will generate luxury goods that will go directly into your merchandise chest located right next to Azar's Overseas Trade in Dublin.
However, in order to benefit from these resources, you'll first need to find the Port Auley deed.
Where to find the Port Auley deed
The deed is hidden in the lair of one of the Children of Danu: the Ash. To find the deed, you will have to go to the northwest of Lough Gara in Kash Corann.
To reach the chest, you will have to go through the entrance at the top of the cave. A destructible wall will get in your way, but an explosive arrow will quickly solve the problem.
As you go deeper into the cave, you'll find a chest just to your right, a little before the Ash location. The Port Auley deed is inside this chest.