You are in for the time of your life, Cruising is very addictive.
Go to your family Dr and ask for a prescription for the transderm patch for seasickness. You put them behind your ear and forget it. No worries at all.
Those handy dandy little patches have saved me from getting sick a few times. Last yr on the Dream we were in the remenants of a hurricane and had a few rough seas. Better to be safe then sorry.