Pick at least one day for each park. We always do two for the MK. The first and the last day are designated MK days. MK in my opinion is WDW. All the rest is just the bonus. With 5 kids of varying ages you may want to know what rides you are doing in advance. Your youngest won't be able to do all the rides. As far as putting them in the order you want to do them. Decide in the parks. Pick out a couple or three MUST DOS and then leave the rest to fate. Believe me, even if you took 14 days at WDW you still wouldn't get to do and see everything that you want to. Pick your favs and then just go with it. It will be much more relaxing to you and the kids if you do!