Hello Star,
Years and years ago I dated a deaf man. Although he could read lips very well, I learned a bit of sign which sometimes helped in communicating, including helping me to realize what a toad he was.
The book I used was called The Joy of Signing. It taught not just the alphabet, but ASL sentence structure, common signs, facial expressions that go with signs to add emphasis, and a whole bunch of other things.
The book has been in print for years and years. You should be able to scare up a copy at your local library.
Hope this helps,
Trinity