I am going on a cruise in 3 weeks and I am worried about how we will communicate. Please help!

Im planning for a cruise next summer but i have no idea how much to save. I have already booked a plan. Im taking a 7 night cruise on the oasis of the seas and I have a book a balcony room that’s 3,500 to 4,000 dollars. But i don’t know how much more money should i save. Please if you have taken a royal caribbean cruise on average how much did you spend, thanks?

I am planning to go on a singles cruise in October. I don’t have a lot of money for fancy clothes like they show on TV. I don’t plan to eat in fancy restaurants either. I am a very casual person.
What should I plan on packing?

My cruise arrives back at the dock in Jacksonville FL at 8am. Is a flight out of JAX at 10:49am to early?