Hi Noemi!
How exciting! There is so much to do and see at WDW, your first trip will surely be a big hit! The first thing I would recommend is to browse the online theme park
MAPS (which you can customize and print),
ATTRACTIONS and
ENTERTAINMENT on the WDW website. This way, you can determine which of them your kids will absolutely love and it will help you to have a better idea of what your schedule will be like. Since you will be at the World for 6 days, you should have enough time to visit all
four theme parks and maybe squeeze in some
Water Park fun!
Your kids will love character dining! You should make advanced reservations to any character dining experience, such as dinner with the princesses at Cinderella Castle at
Cinderella's Royal Table, a meal with Mickey and his pals at
Chef Mickey's or
Ohana's Best Friends Breakfast with Lilo and Stitch.
Have a magical WDW vacation!