You don't state how long you're planning to be in the Orlando area on this trip, but most first-timers vastly overestimate how many parks they can "do" in a given number of days. It's probably better to plan your first visit to be just that - the first in a series of many returns.
First, there's Walt Disney World, which itself contains four separate theme parks - Magic Kingdom, EPCOT, Disney's Hollywood Studios, and Disney's Animal Kingdom, plus two complete water parks, Typhoon Lagoon and Blizzard Beach. Not to mention the Downtown Disney area with shops, restaurants, a Cirque du Soleil theater, Disneyquest (A multi-story game arcade) and much more. Each theme park will keep you busy for at least a full, long day and even then you probably won't experience much more than half of the rides and attractions in each.
Disney resort packages typically include some form of multi-park passes good for the theme parks only. Water parks are an add-on.
The Universal Orlando Resort complex about ten miles from Disney contains two theme parks - Universal Studios and Islands of Adventure. Like the Disney theme parks, each of these will keep you busy for at least a full day.
The Sea World complex, between Disney's and Universal's has it's core theme park plus Aquatica, its water park. Each of these easily fills a full day.
You also might consider the 90-minute drive the Kennedy Space Center visitor complex in Cape Canaveral to get up close with Space Shuttle Atlantis and a real Saturn V moon rocket. With it's launch simulator ride, IMAX movies, exhibits and a side trip to one of the Apollo launch pads and maybe a group lunch with an astronaut, the KSC visitor complex can easily fill a day, though if you're not that much of a science/technology buff you can always spend the afternoon on the beach.
If your plans do end up including some non-Disney days, consider getting a Disney package for the period you want to spend exploring the Disney attractions, then extending it with a camping-only reservation for the days you'll be going to non-Disney properties.
We love Fort Wilderness, and even though our home base is close enough to hear the Disney fireworks every night, we spend a couple of weeks a year camping at The Fort. It's a wonderfully peaceful getaway in the midst of the bustling theme parks.
The best advice I can offer for a new visitor is to get and study in depth a copy of "Birnbaum's Walt Disney World" long before making any reservations. Personal experience. Just sayin'.
Above all, relax, enjoy, and come back again! A good mantra is "I'm not in a hurry, I'm on vacation."