Q: Which kingdoms campaign do I have to install?
A: Actually, you don't need any. In the kingdoms setup, you can just uncheck all the campaigns and the 1.4 patch will install automatically. You will have to manually move kingdoms.exe from the CD through. (for example from CD:\teutonic\main)
Q: My MTW2 is installed on a different drive then SS, do i have to reinstall.
A: Due to SS's nature, you can just move its folder around/change its name as you wish, so just move SS to the right disk. You'll have to manually take care of the start menu and desktop icons though.