Making candles at home allows you to choose the scent and appearance of your candles. Craft stores sell scents specifically for candle-making, but you can also scent your candles with essential oils. The trick to using essential oils is adding the oils when the wax is hot, but not so hot that the oils evaporate.
When wax is melted take out of water and stir in essential oils. The amount of essential oil you use depends on the scent strength of the oil, if your mixing them, and the amount of wax you use.