Hi Terri,
As you estimate you will need 8-10 cabins, you might qualify as a group, which often (but not always) means better pricing. I highly suggest working with a TA who has experience booking groups on cruises.
As the others have said, this is prime cruising season out of the Northeast. So, book as early as you can.
Good luck, and let us know how it goes.
(BTW, I am not a travel agent, either. :smiley: )