It Security is one of most complex subject in computers. To become a good IT Sec Pro you should have a very very strong background on some of the more basics computer subjects. Then once you have knowledge of all the basics then you can move to learn advanced concepts.IT sec pro’s are paid very more amount. Future is very much bright for IT Sec Pro.I amd giving you names of some important books to start learning It Sec.
Operating Systems : ’’mastering windows xp or 2k by mark minasi’’ and for linux ’’redhat linux bible by christofer negus’’
HACKING BASICS : ’’unofficial guide to ethical hacking by ankit fadia’’.
Adv Hacking Concepts: Hacking Exposed Series by scrambray and others.
Networking : TcP/Ip illustrated by stevens
Selected Field books: once you learn this books you have to select a specific field in It Sec then according to it you have to read the books.for example you like to become Pen tester you need to read pen testing books more and more ......
Hope You get help with my info