I love using essential oils. They make my candles smell absolutely amazing. As with any craft I would imagine just purchase those sample size fo and try them out before buying anything bigger. It took me a few online shops to find the one I really liked.
I have about 10 different suppliers for my oils. I use FO's from Snowtop, Daystar, FOH, Peaks, KY, Solas, Natures Garden, Candle Cocoon, BCN, Greenleaf and The Scented Bean. They are all great oils and I use C3 soy wax. Oh, I forgot one. Oklahoma Fragrance Supply has great strong oils also!