A special note...
There are two tools that any VAG owner absolutely must have. Just like your torque wrench and your socket set, your toolbox is crippled without them:
1) A VAG-COM cable/software from Ross-Tech in Lansdale, PA
This cable will connect your laptop to the OBDII port on your car, and enable you to self-diagnose, pull the full code for your problem, and clear out that CEL so you can get on with your life. Having the cable around will also allow you to run software like Lemmiwinks to tweak your ECU a bit.
2) The official factory repair manual, from Bentley Publishers in Cambridge, MA, available from the manufacturer or through many of our dedicated forum sponsors/banner advertisers.
These manuals are comprehensive guides to your car, from wiring diagrams to engine cut-aways to torque specs. Not having one is like doing carpentry without a tape measure - it just won't work out well in the end.
Chances are, many of the things you want to do, or want to know, can be understood by simply having these two things around. No need to post or even use the search - just hook up and scan, or open to the right section and get to work.
So, pick these up, whether it be from the classifieds, ebay, or your favorite car parts source, and get familiar with them. Your ownership time will be much better for it.