I'm so noob at tanking. I got booted from a 55-60 dungeon group because I didn't know where to go in some of the classic dungeons. I realize as a primary healer, I've never needed nor cared about learning the exact path through any of the dungeons, but now as tank most people rely on me for that. Any websites with maps or tricks to know?

I would solo the dungeons with my highest level toon first to get to know the dungeons.
Maybe you should go in as dps for a while till you get more familiar with them.
Try looking them up on wowhead.

tankspot.com
wowhead.com

Next time tell the group ahead of time that you have never run that instance and will need some navigation help. A good group will help you. I would love to know which instance you got booted from.