Hello Greg,
If you're a member of this SX Site, you can check the navigation categories on the left side of the screen and click on "Codes, Docs, Articles". This section provides much information on interior/exterior colors, trim codes, accessories, etc.
As for your questions...
1, 2, 3 - I'm unsure about these. I believe a database exists that is intended to document as many Dealership and Zone Codes as possible. Not sure if it is anywhere on this site, but you can find it on Classicoldsmobile.com
4) Red/Black is referring to lower/upper body color
5) 75 = Matador Red Lower Body Color BB = Black Upper Body (in your case, Black Convertible Top)
6) 30 = Black Bucket Seat interior
7) Not sure about destination charge
I hope this helps.
Kevin