Yes! You should get a little booklet which contains all the information you need plus your luggage tags. If you haven't got this with about two weeks to go, then phone your travel agent or RCI to see where it is. The luggage tags are vital because it tells the ship's crew where to load your cases on the ship. The booklet will also ask you for the information you have provided on-line, so you can safely ignore that bit! Have a lovely time.
So long as you have your SeaPass printed with a barcode in the corner then that, and your passport is all you need. If the booklet doesn't arrive then the porters will have handfuls of blank luggage labels for you to complete and attach to your luggage. You should have also seen sent a shore excursion booklet - but again if you have not thenthis is all available on the royalcaribbean.com webiste.