Lilly W , Nov 01, 2006; 03:34 a.m.
A critical distinction must first be drawn as to which settings can or cannot be saved. Only those settings in the <Custom Setting Menu> (found under 'pencil' icon) can be saved.
ISO, RAW, JPEG, White Balance, etc. are all found under <Shooting Menu> ('camera' icon), the settings of which cannot be saved to a particular Bank and, therefore, remain a 'constant' as you move from one Bank to another.
<1. How should the 4 Shooting banks be set?> Taking into consideration the above, imagine your more common, yet different shooting scenarios and THEN consider which combination of <Custom Setting Menu> options serve each of those scenarios.
<2. How are the Custom Settings Banks set up...> The D200 arrives with default settings common to all four banks. The specific settings for each Bank are set-up (and should be labeled) by the user for the various scenarios you cited: A: SnapShot, B: Sports, etc.
There's much to learn about this helpful feature of Banks. To fully utilize and acquaint yourself with the finer points I refer you to the owner's manual.