CFP

Me and my girlfriend were gifted a cruise as a Christmas bonus by her boss. He paid for the flights, hotel the night before, and the cruise itself. We were sent the reservation number and the cruise is in our names. With RC having the automatic gratuity system, how will that work for us? Do we have to add a credit card to the account when we board the ship? For dining, will we be expected to tip? If we make purchases on the ship, will that be charged to the gifter or will we possibly need to pay in cash for everything? First time cruiser and I want to make sure the staff is taken care of so any help is appreciated.