As first timers may I recommend that you join the meet and mingle party before the ship sails. There are usually new cruisers in the group. Other tips do not let rccl convert the bill to your currency unless you are American let your bank do it.
you could join a large dinning table as likely be people on it to give tips.
you will receive the daily programme of events the night before so you can plan what you want to do. look out for daily offers,
you can take on board two bottles of wine on embarkation day for your cabin.
do not sign up for anything first day, remember if sailing from uk drink price includes the 18% tip in the price.
the staff are there to help, do not be afraid to ask they are used to it.
have a great cruise j
Days at sea check out the lunch in the MDR, used to be a great salad bar.