Hi, I used to be a travel agent, and I would be happy to help any way I can. I have been to Disneyworld a few times ( am planning another visit in the next year, hopefully ).
My first question is how long is your stay?
Transfers from the airport to the hotels in the area are around $28.00 round trip per person, using Mears Transportation . Some of the hotels in the disney will also provide airport transfers for you, just something to keep in mind. Also, you may be interested in booking a hotel that also offers shuttles to Universal Studios, as the ages of your children are perfect for that resort as well.
Once you have a property arranged, purchase ( or borrow from your library ) the Birnbaum Guide to Disney, which is thought of as the disney "bible". I bought my own copies because I would take notes in them and use them throughout my trip.
Disneyworld is a blast, but you need to keep in mind that the more "homework" you do before you go the better, ie.. preplanning your days ( somewhat ) or making dinner show reservations way in advance for a special night out. ( The Hoop De Doo Review is great and very popular, so you will need to nab this one ahead of time. )
Again, I really stress the Birnbaum guide to you, it answers any questions you may have about Disney and is a tremendous research tool. The more work you do ahead of time will enable you to have a more stressfree vacation.
I hope this is a help, please PM if I can help you in any other way.
:7