Hi ajmellu,
Your question is certainly one of the most common around here, so I think simply reading through the boards is your best bet. I would also recommend:
- Purchasing a guide book (I recommend the Unofficial Guide to Walt Disney World)
- Watching the vacation planning DVDs
- Watching YouTube videos of some of the attractions you may be curious about
- Exploring
www.disneyworld.com
With you daughter, you will be a bit limited due to her age at the time. Here are some attractions she may enjoy:
MK: Dumbo, Magic Carpets, Peter Pain, Small World, Pooh, Philharmagic, Jungle Cruise, Tiki Room, WDW Railroad, Astro Orbiter, Buzz Lightyear's Space Ranger Spin, the castle stage show, Country Bears, Teacups, Tomorrowland Transit Authority
EC: Nemo, Spaceship Earth, Living with the Land, the World Showcase, Grand Fiesta Tour, Journey into Imagination, Character Spot
DHS: Playhouse Disney Live, Mermaid, Muppets, Toy Story
DAK: Rafiki's Planet Watch, Kilamanjaro Safari, Nemo Musical, the various trails
Coming all the way from England to Florida with an 18 month old is almost unimaginable to me (as a father of a 2 year old and a 3 month old), but I'm sure it's been done before. Plan ahead and remember not to push your little one too hard. Midday naps are critical!
Have fun!