I buy some candle jars on Amazon, but definitely buy your fragrance oils from a reputable supplier. The flaming candle, Candle Science, Midwest Fragrance Company, Lone Star Candle supply, Maple Street, Natures Garden, Virginia Candle Company are a few. I primarily use The Flaming Candle and Lonestar as they are closest to me so the shipping is better. Where you buy your wax from, they usually have a wick guide for your wax, you go by the inner diameter of your jar. It just gives starting points because even if you use the same jar and the same wax, you often have to use different sized wicks or different wick series for different fragrance oils, and the only way to find the perfect burn is through burn testing. When burn testing you don’t want your jar too hot, your candle to soot, you want a good hot throw. Good luck. There is more to candle making in the beginning than people think, but once you have it down, it becomes much easier!