Hi B, and Welcome to CruiseReviews!
The Carnival Legend is a beautiful ship. Make sure to visit a little known area on Atlantis Deck 3 Forward called the Enchanted Forest. It is a really nice area for quiet reflection and reading. It lights up as you walk through.
My best advice to anyone going on their first cruise is to go with an open mind. Not everything is going to be perfect all the time. Have FUN and go with the flow. They will have a daily newsletter called the Fun Times that has all of the activities and important information listed. If you need any specific information do not hesitate to ask. And get ready for some FUN! You will be hooked on cruising after the first one and addicted like all of us.