If you still have the default setting's press 'P'. And in there you should have something for Leatherworking. Click that and it brings up a recipe book. If you have learned skills from the Leatherworker teacher, there will be patterns there that you can make. Highlight a pattern and it will tell you what you need to make it. If you have all the ingredients already, it will say in () how many you can make of that item.
You get more patterns by skilling up at various NPC's.
Hope that helps and was understandable. Not enough sleep.
Kratrina - Lightbringer - Lvl 36 - Human Mage - Fangs of Wrath
Ashana - Illidian - Lvl 4 - Troll Hunter - KT Newb