Default [Q] Urgent! Nexus 7 error?

Okay. Noob to the whole rooting scene... I have a Nexus 7 2nd Gen with JB and I got the bootloader unlocked and super user is installed on my tablet. My problem is, When I tried to install CM, I'll get to the bootloader screen as he says and go to Recovery mode and select it. I get the unlocked symbol in the bottom but after it's done loading, He gets to the TEAM WIN recovery part and all I get is the Droid logo thats body is opened up with an X type deal. What did I do wrong? Am I missing something? Please be as noob detailed as possible... i'd really like to learn this stuff. Thanks!