I put the same combo on my 330i last Sept and here are my thoughts from what I learned.
1) You do not use the bump stop on the front struts with the Bilsteins. They do not need them and there is no room.
2) That is what I did but I do not think it makes too much difference as long as the are close.
3) The strut will not go all the way through. There is a lip at the bottom of the mount.
4) I just used an air wrench to tighten things down. That was the suggestion to me from a mechanic.
I think that is everything... if not let me know if you have more questions.