Here's how we prepared for WDW.
1. We made all of our ADR's and set a schedule rather tightly as to when we would leave in the morning, what time we had to get up, when we would eat, which parks we were going to, which rides and attractions we would tray to get done each day. We left a LOT of time in that schedule, never tried to pack it too tightly. We also had a "break day" in the middle of the week where we stayed at our resort and played in the pool or just relaxed. It was all written up in a grid format broken into the following:
Across the top the days we would be there.
Down the side,
Wake-up/shower/breakfast
Morning park
Lunch
Afternoon park
Dinner
After dinner
Return to room/bed
The blocks for each were filled in with times and any details.
2. We read the Official Guide and watched the planning video. We reread a lot of it, and had a good idea of what might be very stimulating.
3. We set a dollar amount for the trip for souveniers. He had an envelope with his money and Disney Dollars. We made it VERY clear before we even left home that there was TONS of stuff to buy, and we weren't buying any of it for him, he needed to use his money, and when it was gone, it was gone. He divided it up equally among the days, and if he didn't spend money one day he had it for the next. We bought any snacks he wanted, because frankly he's not a snacker and would rather have a hot dog than a bag of candy. If your child is a snacker, you might want to figure that out before you leave as well. He didn't use all of his money ($50 or so IIR) and we did end up buying him a couple of things when we saw that he wasn't going nuts asking for things--as a reward for outstanding behaviour.
4. We told him in advance in no uncertain terms that he needed to stay with us (he was a runner) and behave, and not be a nudge, and that there would be lines and that he wasn't allowed to ask how much longer, and if he misbehaved we'd go back to the room for the day. We set very rigid rules for expected behaviour and consequences for breaking those rules well in advance.
5. We never specifically told him he would be "rewarded" for good behaviour, being at WDW was enough of a reward. But when he had a very good day we would give him something (a Goofy hat, a little bag of candy, etc.) and let him know that it was because he had been so good.
6. Because we took him out of school for a week, he had school work every day. He did quite a bit of it in the airport and on the plane, but he still had to do 30 minutes each day, more if he got behind. We had him do it first thing in the morning while DH and I were getting ready so he was fresh. He knew we wouldn't leave for the parks until it was done. We only had one day that he dawdled on it, and we held tight to making him finish, even though it meant missing and early entry morning and because of that he had to wait in line over an hour to ride something he really wanted to ride. (BTMR I think)
7. We realized that his needs and wants came first on that trip, so when he wanted to spend an hour playing video games in Innoventions we went with the flow. BUT we showed him DH's watch and said "ONE HOUR" no fighting to leave, no "one more game" or "you blew it" and he understood that would mean consequences, so when an hour was up he was willing to leave.
Hope all this helps! Let me know if you ahve any other questions.
Anne