Good starting books are:
Alan Oken's Complete Astrology
Parker's Astrology by Derek and Julia Parker
The Practical Astrologer by Nicholas Campion
though there are many others that are probably as good as these, they are all written by recognised professional Astrologers and are readily available. They also cover most aspects of Astrology rather than concentrating on only one issue such as Sun signs or Houses.
Hope this helps
Minderwiz