That's the beauty of DCL compared to WDW/DLR...you don't need to do hardly any planning (other than your excursions, room category, how you're getting to the port, packing list, and dining rotation). You can drop your kids off anytime the clubs are open (and they open early and close late--some cruises, depending on length, have a sleepover in the club). They will page you on your wave phone when the kids want to be picked up. You can't really preplan what activities you want to do when because you will not know the schedule of daily activities until the night before when they had out your Navigator (the guide to the days activities/schedule). You'll get your first Navigator when you board/in the cruise terminal. You can generally get an idea what the dress code is for that night (semi-formal, formal, Pirate night, etc).
You will never be able to do everything on your cruise, even if you tried. So for now, focus on what you will pack. And then once on board, you can decide in the moment how you guys feel...swimming? Movie? Kids going to the club and Adult-time (there are activities scheduled that are for 18+)? Nap? It's all up to you, which is the beauty of cruising and why I love it more than going to the parks (well, I should say, I like adding the parks on to my cruise)!