Hi Gloria:
One of the best reference books to start with is published by Yamaha (yeah, they do sound and musical instruments as well as motorcycles).
The book is IIRC "Yamaha Sound Reinforcement Handbook" and is available at a lot of the big chain music stores (Sam Ash, etc.)
The exact title is a bit fuzzy to me as someone "borrowed" my copy a number of years ago and never gave it back.
After a bit of study with that book, another great resource is to try doing some basic sound mixing or monitor mixing for a local band.
Feel free to PM me with any specific questions.....
