I was just on this cruise in Jan. Lots of info in my cruise review in the cruise review section of this website, check there. Lots of photos too!
Regarding the decks and room location. You are on the Starboard side of the ship. When you pull into Jamaica you will not face the island from your side of the ship, the port side faces the dock and the island. In Grand Cayman you will tender in on a smaller boat. In that port your side of the ship will face the island. In Cozumel the ship pulls straight into the dock there and again your side will not face the island, the port side faces the island there. In New Orleans your room will face the city and the pier, the port side there faces the river and the bridge.
You have a good room location, prob not too much movement. The seas were rough for use the first 2 days at sea, but they got better. Regarding the seasickness when people say that you know if you are prone to it by if you get sick in a car they are WRONG! I never ever have gotten motion sickness in a car or on an amusement ride but once on the ship I did get sea sick. The free pills that they have in the infirmary work like a charm and I felt much better after taking them.
The Conquest is an awesome ship, it is so big! Have fun and make sure you read my cruise review for the Conquest for more info. E-mail me if you have any questions.