BTW, what days are you doing the parks? Where are you staying?
My tips for first timers:
1.get there EARLY- I am talking like an hour early. If there are any empty turnstiles stand there. Don't "line up" behind people. They will open all the turnstiles.
2.Hit all the main attractions first. Even if you have to back track later.
3. don't lug a lot of stuff to the parks. I am a minimalist here, even though I am not anywhere else. I wear a fanny pack- park pass, id, ins. card, room key, credit card, cash, wipes, a small ziploc with first aid items- tylenol, bandaids, moleskin (already cut), etc. , disposable camera. Wear sunglasses , sunscreen, a watch and comfortable walking shoes. Bring your own bottle of water ($2.50 in the park)
4. Understand Fastpass and use it.
5. Do a character meal or at least one sit-down meal a day.
6. I like to go back to my resort and take a mid-day break- swim, rest, change. See how you feel.
7. My BEST tip: DO NOT try to "see it all". Enjoy what you do see and don't waste one moment worrying about what you won't. Make yourself stop and smell the roses. There are so many beautiful details you will miss if you just run around riding rides. I'm sure you will have a great time and know that you'll be planning your next trip while you are there!