I just want to suggest this to SK team. With the missions you should explain to the new knight HOW to purchase an item with the AH and how to sell one since it is a major thing in SK game.
Have a regular "noob offer" so they can buy it and sell it afterwards as an exemple. You could also introduce how to craft that way... "go buy 10 green shard, 2 beast scale and 2 sharp fang, we are going to craft a wolver coat!" and give them the necessary to craft to show them how it work. (or a brandish... AH and craft could be put together rather than "craft hot edge and frost gun and come back")