Looks like most of your questions are already answered, but I would definitely suggest you look at going on a day where the track is open for longer than an hour. I am stationed in Germany and have taken my M3 to the ring multiple time. Each time I have been there for about 4 hours and got a couple laps in. If there are any big accidents it can shut the track down for an hour or more.
You should also keep in mind that going to the track and watching from one of the look out points is also extremely fun. You can see all kinds of exotics go around the ring. I never go to the ring without spending some time just watching from the side.
- 2010 135i LMB
- 2012 M3 MR
- 2008 M3 JZB