Hi and Welcome to Cruisemates.
Did you receive a booking number? If you have one, Google Carnival and register on their site. You will get tons of info, plus give you lots of questions for us to answer.
You are on the bottom of rooms, for guests, but not on the bottom of the ship. You also have rooms above you, so the noise should be limited. The Glory is a favorite for many people, plus it is the sister ship of other ships, so you shouldn't have any problems getting answers.
Good Luck and Congrats.