Within each cruise TA site, there are endless training options. Take your time, but remember, the more you know, the more you sell.
Disney Cruise Line- You should know all of the 5 ships (the Wish is the 5th) and the basics of each. Disney Dream, Disney Fantasy, Disney Wonder, Disney Magic.
To book a Disney Cruise, you can simply call DCL (Disney Cruise Line) or use the DTA site. You will need to put a 20% deposit but you can put a hold on a sailing for 3 days before the deposit.
Please always check the updates at DCL- https://disneycruise.disney.go.com/why-cruise-disney/experience-updates/us/