I got in thru Cisco in college.
Learn the following:
1. Network functionality and connections (ex: Packets, Handshaking)
2. Learn Wireless and Security (WEP, WPA, WPA2)
3. Learn how Workstations works with Networks (OSI model)
4. Learn the impacts of security in a whole (More in depth, usually thru college classes)
5. Learn how Applications are designed to communicate (SQL, Databases, PHP, and Ruby)
6. Learn a few program languages (C, C++, C Script, python and VBS)
7. Learn how to use network software and how they function (eg: wireshark, snort)
8. And more importantly NEVER STOP LEARNING!!!!!!!!!
That's how I got into the Game. Good Luck.