These sites give you an understanding of how to use and create Essential Oil blends.
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Blending essential oils is all about inhaling!
For those of you who are brand new to essential oils and aromatherapy, one of the best ways to begin creating personal fragrances is by experimenting with combining essential oils that you love from the very first inhale.
Source: Blending 101: The Art of Pairing Essential Oils Drop by Drop
Adding Carrier Oil for Topical Applications
Depending on the topical application of your blend, you will want to add some carrier/base oil. When creating a therapeutic essential oil blend, you may want to use about 28 drops of essential oil to 1/2 oz. of carrier/base oil such as fractionated coconut oil. When creating a body massage blend, you will want to use a total of about 50 drops of essential oils to 4 oz. of carrier/base oil such as fractionated coconut oil. Remember to store your fragrant creation in dark-colored glass bottles.
When blending, add one drop at a time to your blend, then mix and smell. Allow the blend to unfold slowly and inform you about what oils to add and how much. We often need much less essential oil than we might imagine. Remember to keep track of the blends you make by recording which oils you used and how many drops of oil. When you finish the blend and want to make it again, you will have the recipe!
Source: Aromas | Aromatics International