You will have such a great time. So exciting.
We have just booked via the Walt Disney world website(Disney world.co.uk). For our dates it was slightly cheaper to book both hotel and flight via Walt Disney travel agency rather than separately (i.e. Flight and hotel). I have used them before and have been impressed with the service. They can walk you through the process and will remind you to book dinner etc
The deal at the moment is good, free dining plan depending on where you stay plus $200 dollars gift card that you collect when you are there. The photo plus offer is also great as you get everyone in the same photo and can link it to the rides. I have also booked separately, as wanted to do more of a fly drive, and it isnt too complicated.
Whilst I remember, the things that I would do are
- Identify hotel and dates
- Book flights
- Sort out esta, this should cost $12 each
- Sort out uk travel to and from airport
- Make sure that I have booked the magical express from Orlando airport to hotel and return
- Book dining
- Book fastpasses
- Sit back and enjoy
Staying onsite is brilliant. You can book the bus from the airport to the hotel (and return) and then onsite transport for everything else. We have stayed in old key west and Saratoga springs - both of which are villas rather than hotels as we prefer them. These have less theming but a bit more space. You may want to see which park you are likely to spend more time in and stay closer to that. We have also stayed in a good neighbour hotel, the b hotel, and could walk to Disney springs. It had no theming but was cheaper.
When you arrive at a Disney hotel you should be given a magic band. You can customise the colour on line before you arrive and put names on them. They act as your park tickets and door key. It is also a nice souvenir.
The important things will be to book any character breakfasts or meals 180 days(I think) in advance and book fastpasses 60 days before. There is a meal in cinderellas castle which is visited by the princesses and these tend to be a lot more interactive than just queuing to get photos however you may not get the princess that you particularly want. The queues for meet and greets with princesses can be very long but I think that you can get fastpasses for them. It is worthwhile booking table service meals but quick service is also good. We have had some good salads in the hotels and the earl of sandwich does nice hot and cold wraps. If you are not on the dining plan then it is cheaper to eat off the wdw site, but you do need transportation.
Best place for more info is dibb forum www.thedibb.co.uk/forums/
One final thing. It is big and there is a lot of walking. You may want to start everyone doing some long walks to get used to it!