Candle magick is one of the easiest, and least expensive, types of spellcraft. However, as with any kind of magick, it is best to make the most of your preparations to ensure a strong magickal energy connection. One of the most overlooked steps is the proper anointing of the candle or candles you will be using.
For the strongest effect, I recommend using an oil specially formulated for your purpose or an essential oil whose properties match your purpose. If this is not possible, you can use virgin olive oil as a substitute.
There are several methods for anointing your spell candles, but this is the one I have found to be the most successful.
If your spell is to get rid of, or banish, something: With oil coated fingertips, start at the center of the candle and draw your fingers up to the tip of the candle. Lift your fingers up, slightly turn the candle, and repeat as many times as necessary to coat the top end of the candle. Once you have coated the top of the candle start at the center again, this time drawing your fingers down toward the base of the candle. You do it this way to draw things away from you.
If you are trying to attract something, or draw something to you: With oil coated fingertips, start at the bottom of the candle and draw your fingers to the center of the candle. Lift your fingers up, slightly turn the candle, and repeat as many times as necessary to coat the bottom end of the candle. Once you have coated the bottom of the candle start at the top, this time drawing your fingers down toward the center of the candle. You do it this way to draw things toward you.
You may find this method more difficult if you are using a shaped or figure candle, but do your best. While anointing the candle, be certain you are focusing on your intention. If you do not focus mindfully on your purpose, you will not be charging your candle with your purpose.
A couple other things to remember:
Be certain to use the proper color for your intention.
If you are using different oils for different candles, be certain to wash your hands in between.
You can overlap 2 or more oils on a single candle if you need to. One reason you may want to do this is to add a spell strengthener (such as Dragons Blood) over a purpose oil to increase its potency.
With many types of candle magic it is ideal to burn the candle all the way down. With this in mind, you may want to get smaller candles that will burn quicker. A witch can lose her oomph for a spell if she has to wait 15 hours for the candle to burn :)
Visualization is a powerful tool. Dont be afraid to vividly imagine your desire coming true as you anoint and use your candle.