Much has changed logistically. A group that size on DDP will likely need reservations for all table service meals. Tipping should be discussed on the Tipping Information Thread but in case Disney does not inform you, all parties of six or more pay an automatic 18% tip on all table service meals. Reservations can be made 180 days ahead. They just switched back to 180 days so it's not clear what the effect on booking the ultrapopular restarurants will be but if you want any of the following: Le Cellier, Chef Mickey's, Cinderella's Royal Table or a Fantasmic Dinner Package, you should probably be prepared to book those as soon as possible.