There was some very good articles in the the Australian aviation magazine called Aircraft in 1988 written by Gordon Bransom, based around the
PT-6 in a Piper Cheyenne.
Good notes for first time turbine pilot, may be on the net or if you know somebody that collects aviation magazines.
American AOPA have done some articles on turbine engines as well, and also flight tested the Caravan, Conquest which can provide some good info as well.