iDrive is part of the Navigation option, so if you ordered the Navi option ($2,100, IIRC), you need the iDrive manual.
The Premium package is irrelevant here as the Navi/iDrive is a stand alone option.
For my '08 128i, the iDrive manual included instructions for the radio as many settings are made through the iDrive interface. Cars without Navi/iDrive came with a separate Radio manual - probably the 663 you mention.
(BMW doesn't make life simple, but the 128i is a great car - enjoy!)
Tom
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