I was wondering why nel said not here, as the CCNA forum on TechExams is a good as place to start as any! I would recommend you pick up the CCNA Exam Certification Library and start reading.
for one, not in this forum. Try the ccna forum. http://www.cisco.com/web/learning/le3/le11/learning_all_certification_exams_list.html try this link to take a look at the cisco certs.
Another option is to subscribe to http://www.safaribooksonline.com They have almost the entire Cisco Press (and other publishers) library online and the plans start at $9.95 a month. I used it when studying for my CCNA.