Jill,
Don't let it all overwhelm you. You are coming at a time when crowds are not overly huge, so keeping your schedule a bit open will be OK.
I can guess at the best way to plan your days, but you should definitely revisit your daily plans in early July when the schedules for October are posted on the Walt Disney World website.
I would plan on more time at the Magic Kingdom, based on your kids ages. Here is what I would do, assuming you don't have the Park Hopper option, and that you have time on the 4th do to a park, but not on the 9th.
- October 4 - Magic Kingdom
- October 5 - Hollywood Studios
- October 6 - Magic Kingdom
- October 7 - Animal Kingdom
- October 8 - Epcot
This is a good planning start. Send me back more questions, letting me know if you have Park Hopper, what your overall interests are, if you need restaurant suggestions, etc. Break them up into several questions, by topic, so your question does not get cut off.
And again, don't worry. We will work through all this so that by October you are a Disney World vacation pro!
Have a magical vacation!