Welcome back to planDisney, Peter!  I am happy to get you started with your plans to book a vacation on Disney Cruise Line.
Once you find the perfect itinerary, you can book your cruise, and it will be 
held for up to 3 days, with no deposit required.  On the third day, when the deposit is due, it will be 20% of the voyage fare.  You can then make payments whenever you would like via the 
Disney Cruise Line website or the 
Disney Cruise Line Navigator app up until the final balance is due. For 3-Night itineraries, your final payment will be due 90 days before your embarkation day.  
Peter, currently, both the 
Disney Magic and 
Disney Dream have 3-Night itineraries sailing from 
Fort Lauderdale, Florida.  The Disney Wish has 3-Night itineraries sailing from 
Port Canaveral, Florida.  The price will depend on the time of year of your sailing and the type of stateroom you select.  
If you have any other questions, sail back to 
planDisney. Your magical vacation onboard Disney Cruise Line awaits!
JoVonn