Hello and welcome to EH-Net.
First I would recommend to search through the forums as this question was not asked the first time and you probably will find some answers already given (most useful threads you will find in
this section).
I am currently preparing myself for the CEH, so I can share with you the books which where recommended to me and which I am using for learning as well:
Official Review Guide:
http://www.amazon.com/CEH-Official-Certified-Ethical-Hacker/dp/0782144373Exam Prep:
http://www.amazon.com/Certified-Ethical-Hacker-Exam-Publishing/dp/0789735318Prep Guide:
http://www.amazon.com/CEH-Prep-Guide-Comprehensive-Certified/dp/0470135921Topics which will be covered can be seen on the outline from EC-Council's official website. For those topics in which you are not very familiar I would recommend some other books which are focusing on those. If you have any more specific questions please feel free to ask.
Good luck for your studies.