If I were you I would start a new thread for each of your queries which would be quickly addressed. Your D200 is not so very different from your old bodies. Exposure and apertures are just the same. To keep it famimilar use centre weighted metering and manual exposure. you should be on familiar ground there. The next step is settings. Iso is as per film. Choose the speed you want. White balance can be set to auto and adjusted later if you shoot NEF which opens up a whole load of questions. If you shoot jpeg make sure that you select the appropriate white balance. Daylight will be just like film and you could use filters if that suits. Then there are the custom settings. Using a combination will give you a particular look much in the same way as Velvia was different to Astia.
As I said the easiest way is to have particular questions addressed individually as there is too much to be addressed in one post.
Your main problem will be familiarity rather than a paper weight it will all become clear
Always look on the bright side of life de dum de dum........... :) :) :) Dave C Scottish Nikonian My Gallery