Now that you've chosen a cruise and a company, calculated your vacation budget, obtained answers to all your questions, all that's left is to reserve your place.  To guarantee your reservation, you need to send a deposit (the amount of this deposit is indicated on the fare schedule) plus total amount for insurance, if you take out any.  You might also need to take care of airfare if you're getting a plane ticket from the cruise company. The payment balance should be taken care of in accordance with directions provided by the company (in general, this will be at least 90 days before departure) and you might be asked to fill out some forms (visas or others).

You will then receive your trip documents.  Once you have received these documents, verify them, keep them together in one place and do not forget them. When the time comes, take this file and your passport with you, so that finally you can get on board ship and begin the cruise of your dreams.