Many JWE members have cruised before and are a wealth of information.

CruiseCritic is a go-to place for Cruise info but I've seen plenty of mis-information there too.

My personal pet peeve are people that book "a great deal", and THEN start asking what to do, what to expect etc....

My advice:

What destination have you dreamed of visiting? Chances are a cruise will take you there.
That's where you should start your research.