All Beliefs are Welcome Here!
My husband always recommends The Complete Idiot's Guide to Alchemy as a starting point for people. I haven't actually read it myself yet (I've been busy with my own studies), but he's loaned it out to others before and I've never heard any complaints.
Thanks. It gets decent reviews on Amazon, too.
What type of alchemy? Are you talking about the alchemy that evolved into chemistry or are you referring to spiritual alchemy?
Try looking for stuff on spagyrics, such as this book.