I'm not sure I'd take him on the tour just yet, being he's a first timer to WDW. If it were me, I'd give WDW some time for the "magic" to sink in and then on your next trip maybe take the tour.
To answer your questions:
Yes, it's called "Keys to the Kingdom" tour. I've taken it myself and it's wonderful!! As far as reservations, I believe you'd need to make them in advance since these tours are taken out in small groups. I'd try calling 1-407-WDWTOUR to make the reservation. Here is some information I found regarding the tour:
"Offered daily this four and a half hour to five hour tour celebrates Disney Magic! Learn about the Magic Kingdom's history, and backstage secrets. Hear stories of Walt Disney, his visions, his philosophies, and his accomplishments. In addition to Disney history, Guests finally get the opportunity to find answers to all of those "neat" Disney trivia questions and get an inside look at how the MAGIC KINGDOM operates by venturing downstairs to the main Utilidor entrance, MAGIC KINGDOM Wardrobe, and Cosmetology. Guests also visit the MAGIC KINGDOM Production Center, where they have the rare opportunity to see parade floats up close.
At the 2 1/2 hour mark, the group breaks at the Columbia Harbor House for a delicious meal which is prepared and waiting for all the Tour Guests. Orders are taken in the Tour Garden, next to City Hall, upon check-in before the Tour begins. Menu choices include a Fried Chicken Strips Basket, Fried Fish and Chicken Combo, Garden Galley Salad (mixed greens with feta cheese, pecans, grilled chicken, and pineapple in a zinfandel vinaigrette), Starboard Deck Sandwich (Toasted bread topped with ham, cheese, tomato, and broccoli slaw), and New England Clam Chowder or Vegetarian Chili served in a bread bowl.
Offered daily at 8:30, 9:30 & 10:00am and 1:30pm. Tour starts at City Hall just inside the Magic Kingdom Main Entrance.
Cost is $58 AND Admission to the Magic Kingdom! Discounts as of January 2002: DVC, AMEX, The Disney Club & Annual Passholders 15%; Cast Member discount available."
Hope this helps you out,
Craig - Atlanta, Ga. USA