Double the suggestion to browse through
www.CruiseCritic.com
Among other topics, you'll find sub-forums for the cruise line, for Roll Calls for your particular ship and sailing date, for Ports of Call (where your ship will be stopping along the way).
Also, topics like hints for first-timers, Ask A Cruise Question, tips for cabin selection, etc.
And then the topics like travel insurance, air travel (there are a few specifics that are relevant for cruising that might not be emphasized here on FT), and lots more.
Enjoy!
GC