Hi Sandra!
A first trip to the Walt Disney World Resort can be overwhelming. However, as the crown jewel of the theme park industry, rest assured that most guests will have a great time at Walt Disney World even with little to no planning!
First, I recommend ordering the free Walt Disney World
planning DVD.
It should arrive before your trip in July. Then I recommend buying the book "The Complete Walt Disney World" by
Julie and Mike Neal. It is a great book for first timers and it is full
of color photos; it will help you to determine what interests you and
your family.
To help you plan each day, I recommend visiting the independent website TouringPlans.com. That's the website for the "Unofficial Guide to Walt Disney World", another good tour book. There you can look at their crowd calendar for the days you are visiting to get a feel for the expected crowds and to see their recommendations on which park to visit on which day. I also recommend looking at a couple of their touring plans which are step by step guides to minimize the time you wait in lines. Their recommendations are based on a lot of math and years of data collection. As an engineer, I'm a big fan of their work.
Hopefully this will get you started. Write back if you have any more questions!