I am assuming you are sailing on carnival, based on the itinerary.
Advice I always give to CCL cruisers
24 HOUR PIZZA!!! TRY IT, ITS WONDERFUL
If you drink sodas, buy a fountain fun card it's worth if, and if you are really slick, you can buy one for two people and use it (doesnt have name or photo on it)
Early Dining!!! lets you see the early show, still get to the casino and night club. Sure, if you are in port, you may have to eat in the LIDO buffet, but so what, you will want to do that at least once on the cruise anyway.
Also, Second night is always formal. Dress for church/wedding or nicer and you will be fine.
DON'T BE AFRAID TO ASK FOR EXTRA PORTIONS/SERVINGS. IF YOU FINISH ONE LOBSTER TAIL AND WANT ANOTHER, ASK!!!!!
They won't look at you funny or even care.