Hi Beatriz!
I am guessing that your question pertains to planning a full vacation to Walt Disney World and not just one facet of the vacation.
The easiest thing to do is to log on to
www.waltdisneyworld.com/plan and start to get a picture of what a Walt Disney World vacation entails. Once you see what interests you and your family, you can click on separate links for either packages (food, lodging and park tickets) or you can price and pay for your trip separately. It is easily customizable.
Also, as you begin to figure out what, exactly, you are interested in, we will be better able to address your question more specifically here at the Moms Panel. For now, I would log on to the site and start to get ideas about when you want to go and where you want to stay.
I hope this helps get you started and feel free to log on again to ask more detailed questions. It is our pleasure to help you!! :)
Chris