I'm a member of ADF (Ár nDraíocht Féin so we call it ADF for short).
If you are searching, which it seems you are, I recommend a book called, "The Complete Idiot's Guide to Celtic Wisdom." The name is a turn off for some, but the book is actually very good. It's an easy read and explores different facets of Druidry.
I myself, while a member of ADF am more of a Celtic Reconstructionist... yeah, that usually clears the room. What that means is that I research the folklore, mythology and archaeology of the Ancient Celtic peoples to find out what they (my ancestors) did, and believed. While there are many gaping holes in what we know about the ancient Celts, there is quite a bit of info on them as well.
Please let me know if I can answer any questions.