Hi Trish! Your trip is going to be here very soon! I am sure your family is getting "too excited to sleep"!
You can go to www.touringplans.com to find some of the most well thought-out and time tested plans available. They are a great reference, but you also want to keep in mind that this is a fun vacation, so a little spontaneity should be considered! I love having a plan when I go, but we generally don't stick exactly to it. I have always been told that when you go into a park, you should go left, since most people will go to the right first...just a thought for you!
As for Cinderella's Royal Table, you just never know! It probably depends on how big your party size is. I was able to make a reservation online for the day of at lunchtime when I was there with a friend. Generally, smaller parties will be easier to get in. One of my friends took her daughter but left her son with her husband because they could only find a spot for a party of two. I have two boys, and can tell you that they have never wanted to go there, so it wouldn't be worth my money to pay for them anyway.
Just keep checking the wonderful online
Dining Reservations service. You never know what will pop up!
Have a great trip! Let me know if you have any other questions about planning!