We are a group/family of 55 leaving out of Miami.
I sure do hope you are working with a good crusie travel agent who is familiar with groups. They should be able to advise on much of this and make sure things go smoothly.
The group's reservations should all be cross referenced, and all dietary complications should be submitted to the special needs dept.
The agent should be able be ready to explain all the workings of this. With a group this size you should have also earned some group perks, like perhaps a group cocktail party or shipboard credit.
To try and arrange all these details by yourself, with little experience, will surely lead to headaches for you.