I did not see table game instructions mentioned in the activity listings on my last cruise. Ask in the casino once on board.
There are instruction videos on line.
I now & then I'll play some craps. It looks difficult, but in reality it's easy. Pass line (win or make your point) bets are common. With a pass line bet you win even money if the player rolls a 7 or 11. You lose if the player rolls a 2, 3 or 12, called craps. Any other number is a point. You win if the player rolls the point number before rolling a 7. You lose if the player rolls a 7 before rolling the point number. There is more to it, such as odds, but that's the 1st base easy description. Craps has the lowest house edge in the casino. Negative on craps is that the table usually is only open later in the evening.