The dTTL on the D1 series cameras leaves a lot to be desired. If you have a Metz flash, you'll probably be alright to use it in the 'A' setting for most tasks. If that's not adequet, see about getting a SD80DX flash on e-Bay, or somewhere.
A flash is an important thing for a photographer, you often have to fill flash in bright light, or use it a main light in dark situations. You really have to have a good handle on it.
David Buzzard