Instructions
Right-click one of the various guards to bring up a clickable dialogue box. Click the option that refers to profession trainers, then click "Leatherworking" to flag the location of the trainer on your mini-map. The leatherworking trainer "Maris Granger" can be found in "Old Town."
Right-click the leatherworking trainer to access available leatherworking recipes and skills.
Right-click the reagents trainer to access crafting material needed for many leatherworking recipes.
Visit the auction house in Old Town to purchase reagents that are not readily available. You can also sell any material you have crafted on the auction house.