Q.) What's being brought from CoC the first?
A.) Your choices and actions in the first game may have effects on the second by importing your save, however, we stress that CoC2 is in an entirely separate world from the familiar, if warped, grounds of Mareth. You won't be seeing familiar faces from the first game, nor will you be playing your Champion, but long term developments might influence events in the second game. This has been likened to the Dragon Age series, if that helps.