This web link is how I made charcoal when I first started smithing. It works real good, if you can get good coal from centaur forge then what are you thinking of making charcoal for? Good smithing coal is so much superior to charcoal. You will burn up a lot of charcoal compared to coal. Charcoal is much better than bad coal though. If you are going to blacksmith full time, and use charcoal, then you should find someone to make your charcoal for you, cause you will spend a lot of time making charcoal.