I have two things to add here, since this is one of the few questions on this board I can actually answer.
1. You are going to be autocrossing a car that's just not made for it. I went from a V6 passat to an Integra, and there is a HUGE difference in how they handle (although the passat is superior in almost every other way). Then I went to a Miata (an old miata mind you), and the Integra (/Passat) are not even remotely comparable.
2. You are going to beat the hell out of your suspension bushings and ball joints, so be ready to replace them. Amusingly enough, it's easier on the passat than many other cars, though I didn't think so at the time. Same with clutch and synchros, as well as most other trans components. Engine / trans mounts won't enjoy it either.
If I were you, I would just practice the basics on some roads at night, rather than trying to full out race the car, especially if you are new to this. And yea - I know "back roads" is "horrible advice" - but I mean truly empty roads, without crossing the median, and slowly working up to where you see severe lean / tiny traction slips.
edit: Oh, and turn your music off when you do it - just saw the video above, again, unless you are just messing around well within your limits.