Once you've created your Cruise Group you might want to promote it for potential members to know where to find you. The easiest way to do that is to post your Cruise Group Link in FB Groups which focus on DCL cruising. Below are some examples of FB Groups where you can consider posting your Cruise Group Link.
NOTE: Some FB groups do their best to maintain accurate listings of and welcome postings of upcoming cruise groups, while others might not. But it's generally 'good manners' to ask an admin in a group if A) it's okay to post your cruise group link and B) they will post it on their cruise group page if they have one. Just know that your mileage may vary in terms of responses you get.
Here is a list of great FB groups to list your cruise group
Created by Carol Spence
Bear in mind as a byproduct of promoting your group in many places you will increase your chances of attracting unwanted company trying to join your group... As such you might want to vet your potential members. Thoughts on how you can do this are at: Vetting Possible Members