For aion players, they enjoy the freedom of being able to learn every single type of craft, no matter what they have made a choice of their character. They have to comply with the only limitation that is each character can only be allowed to master two of them. The one you choose to master is relying on your main goal, either to sell to others for a profit, or the type of character you are playing.
In the case you set a goal to be a salesman, you are recommended to read Aion Kinah Guilde-Professions to see which crafting skills are the best suited for making a living in the game.
If you are Asmodian, the following is what you need to do first to start honing your crafting skills.
For Asmodae, go to Pandaemonium, then the Temple of Artisans. Once there, speak to the appropiate NPCs to learn the different crafts: