Personally, I've found that keeping a supply of coke from the last fire is helpful. Often starting the new fire for the day the lay is as such; fire starter (paper, cardboard, wood shavings), new coal, coke, coke/coal mix. Initially if you have a coal fire you'll always have smoke but with practice you can minimize the volume and duration. If you decide to switch to coke from a manufacturer instead of coking while you forge, most will tell you not to quench the coke. If you do you'll learn a lesson quickly, like the novice starting a propane forge without igniting imediately. Forge away.