You will find lots of good info in the forums here, and on intercot.com. and on allearsnet.com -- search on hints and tips, and any topics that interest you.
#1 tip -- plan, but don't overplan -- WDW is huge and you will not be able to do everything (altho you are going at a "low crowd" time, which will help).
#2 -- use PhotoPass a lot (you can search on that to learn more about it) -- skip a TS (table service) meal if you need to in order to have the $99 to buy the CD -- that way you and DD (dear daughter) can be in lots of photos together.
It can help you get better tips if you say how long you're going, where you're staying, will you have a car, and any special info you need.
Have a great trip (am sure you will!).