If you're just starting, I suggest The Fragrant Pharmacy by Valerie Ann Worwood to add to your library, which you can get at a most reasonable price from Cygnus Books. The link will take you right to it.
She suggests a starter pack of: Lavender, Tea Tree, Eucalyptus, Peppermint, Chamomile, Geranium, Rosemary, Thyme, Lemon and Clove, which pretty much cover everything, including snake bite!
Culpeper have all of them and the oils are bright, lively and energetic. I do like Culpeper more than any of the other suppliers - they have a good turnover and the staff are helpful and knowledgeable.
Fx