Hi Welcome to Instructor Network Cisco Router and Switching information page..
It is highly recommended to get proper training for Cisco Certification. Cisco has created a series of courses that are the best I have seen. Please Locate a Cisco Academy near you.
Of course I recommend stopping by DeVry University - Chicago Campus and experience my Cisco Academy classes.
Useful Information
10 Cisco Router IOS commands you should master
Professor Hyzny's Router Command Sheet