Try to use an area that has already been used for a campfire. You will be able to tell where someone has built their fire previously due to the ashen and scorched area of the fire and also there will be a fire ring in place. Keep your fire small. These days a large fire in any wilderness area frowned upon. Large fires take more fuel to generate which means you will be using more wood.
Large fires can also easily become out of control.
Keep it small and to a minimum. By doing this not only can you save disaster from happening but other campers in the area will not become annoyed by the large fire. When starting your fire try to utilize a fire ring which has been previously used. Re-using these fire rings lessen the effects on the environment and make your job easier in the process. Usually some minor reconstruction must occur but even this is easier than beginning one from scratch.