Kyla, welcome! And congrats on your first trip, hopefully you'll come home completely addicted like we are
When you are going is pretty important in determining what types of discounts are available. If you have flexibility, mid fall is a good time as there are normally multiple discounts including free dining.
The websites mentioned are great sources, and I will add another. Mousesavers.com will have all the discounts and packages that are going on right now-check it out!
You didn't mention what level resort you want to pay for, so I'll tell you my favorites at each level, going on your info that you have four people: Value: Pop or All Star Movies /Moderate: Port Orleans French Quarter /Deluxe: Contemporary or Beach Club.
Another good thing to do is get on the WaltDisneyWorld.com website, and order a Disney Vacation Planning DVD, it is free. While you're at it, go ahead and register for a free account with your email. You'll need it in the future!
The next best thing is read, read, read these forums. So much great info here. And also on the Disney Mom's Panel website, where you can ask questions as well. Let us know what you decide, and have fun planning!