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The time it takes for creosote to build up in a chimney can vary depending on how often you use your fireplace and the wood you burn. Creosote can start accumulating after just a few fires, especially if you burn unseasoned wood or allow fires to smolder. Regularly using the fireplace without proper maintenance can lead to significant creosote buildup within a few months. To prevent hazardous buildup, have your chimney inspected and cleaned at least once a year.

Chimneys should either be sealed or waterproofed, which is different from sealing off—closing at both ends—a chimney. Waterproofing and sealing are both crucial steps to take to prevent water damage and the chimney leaking inside the house. While waterproofing is more comprehensive, both help safeguard your chimney, extending its life span and preventing expensive repairs. 

Wood is classified as either hardwood or softwood. For firewood, hardwoods are generally the best choice as they tend to burn longer, hotter, and produce less smoke than softwoods. Recommended hardwoods include oak, hickory, maple, cherry, ash, beech, birch, elm, and walnut. Oak is a particularly good option as it's widely available, slow-burning, and doesn't produce much smoke or sparks. Some woods, like oak, hickory, and cherry, also emit a pleasant scent. It is best to avoid softwoods such as eucalyptus, poplar, and willow, as they create a lot of smoke and have a high moisture content that makes them difficult to light and burn efficiently.

Yes, if your gas fireplace has a flue, you typically need to open it when using the fireplace. Although gas fireplaces don’t produce the type of smoke and soot that wood-burning ones do, they still release combustion gasses like carbon monoxide. Opening the flue ensures these gasses safely exit your home through the chimney. Not all gas fireplaces need a chimney, however. Always check the manufacturer’s instructions for your specific gas fireplace model, as some newer models may have different ventilation requirements.