My partner and I are looking to do our first cruise - Could use some help!

Do we get any discounts for being New Orleans residents?

Where should I be searching? Is there ONE place I can search all or ...?

I'm usually good at this, but realizing cruises are a little different than hotels or flights.

* We would prefer no children (but not a deal breaker), if that matters.

** Also any tips we may not think about!

HALP!!!