Working with essential oils is a great way to empower yourself, charge a candle, or many other magical activities. If you're interested in getting into working with oils then I would suggest getting some good books on the subject. Two that I suggest for someone starting out with oils are "Incense, Oils, and Brews" and "Magical Herbalism" both by Scott Cunningham.
Some useful on-line sites include the following:
And of course in working with essential oils there are some cautions:
Oils which ARE NOT SUITABLE FOR HOME USE include, but are not restricted to: cinnamon, clove, hyssop, and sage.
Oils which SHOULD NOT BE USED DURING PREGNANCY include, but are not restricted to: basil, clove, cinnamon, fennel, hyssop, juniper, marjoram, myrrh, peppermint, rosemary, sage, and white thyme.
Oils which SHOULD NOT BE USED FOR STEAM FACIALS include, but are not restricted to: bay, clary sage, ginger, juniper, pine, and tea tree.
Oils which are PHOTOSYNTHESIZING include, but are not restricted to: lemon, bergamot, lime, and orange. Do not go out into the sun for at least two hours after applying these oils to your skin.
All essential oils should NOT BE INGESTED if you have, and are unsure, please contact your Poisons Information Center
Do not apply essential oils directly on the skin. Always dilute them in a carrier oil such as almond oil, jojoba, or grapeseed oil.