Why does Candle Magick Work ?
As a candle burns it releases not only it's wax but it's color into the atmosphere. What ever has been connected with the candle as in the form of embedded energy or written on the candle will transmigrate to a plane where it can do what you have intended and focused on it to do.
A candle, like everything else used for a magickal purpose, has to be consecrated. Use the general consecration for candles. They are creatures of Fire or of Art.
After consecration a candle must be dressed. This consists of anointing the candle with a special oil you have chosen for the purpose in mind. If you are drawing money to you I would suggest "Money Draw". If you are healing a friend I would use "Health" oil. The recipes for these and other oils and incense are in Herman Staler's, "Magical Formulary" or Scott Cummingham's. Both are excellent.
To dress a candle correctly, dab some oil on your finger (and be liberal) touching the top of the candle say, "As Above". Touch the bottom and say, "So Below". Starting at the center touch the candle with more oil and move your finger to the top. Lift you finger off and place it again in the center and stroke the candle to the bottom. Do NOT move your finger in an up and down motion. This confuses the energies. Do this until the candle is coated.
There are many other things you can do to embed a candle to your purpose. You can etch runes in it; a name on it; a purpose for it to perform.. Really the list is endless.
If you are doing a Solar spell consult the table for the proper hour, i.e., Sunday on a Sun hour. Consult the celestial guide to see if Mars and Saturn are not square, in opposition or conjunct to your purpose (unless you are trying to reck havoc... watch that Karma) and that the Moon is not V/C. (void of course). For a spell that is to bring things to you the Moon needs to be "waxing" . For a repelling or banishing spell the Moon needs to be "waning".