http://www.bmw.com/generic/com/en/fa...rdschleife.pdf
Here's a turn-by-turn guide for the Green Hell. We just got the Logitech for GT5 and it is amazing!!! There are better simulators, but they are expensive - ranging from $20,000 - $160,000. I got to "drive" the $160k one at the Autosport Engineering show in the UK last year and it was incredible!
Good luck with your quest and training - I'm very jealous, I'd love to go to the 'Ring one day.