Blacksmithing is great for Paladins or Warriors, who can use the skill to create their own equipment. It is also good for making money by selling weapons and armor to the classes that can use them.
Becoming a Blacksmith First you need to find a blacksmithing trainer. You may have to ask other people where to find a trainer. Blacksmithing trainers are usually located near a forge or anvil. After you have learned basic blacksmithing, open up your abilities book (hit "p") and look for the "Blacksmithing" icon that has been added to your abilities. Now you need to go buy yourself a "blacksmithing hammer." These are usually sold by a "trade merchant" or other merchants near the blacksmithing trainer. You must have your blacksmithing hammer with you whenever you create an item. Some items don't require you to be near an anvil to create them.
Specialization At high levels, players have the ability to specialize as an Armorsmith or Weaponsmith. Additionally, Weaponsmiths can specialize as Swordsmiths, Axesmiths, or Hammersmiths. Decide what is more important to you such as weapons vs. armor. You'll be able to create specialized items that are very powerful and likely valuable.