A neat little article I found on ehow.com.
Step 1: Know what you can and cannot do.
Too many players try to make plays that are beyond their ability. John Stockton always knew what he could and could not do. He made the safe passes. He threw crisp chest passes, bounce passes and wrap around passes. He was not concerned about making high light reels; all he wanted to do was get his teammates in position to make an easy open shot. If you want to play like John Stockton, be unselfish and make safe passes.
Step2: Play for your teammates.
John Stockton could have averaged well over twenty points a game whenever he wanted. He was one of only a handful of point guards who consistently shot over fifty percent from the floor. However, he never averaged more than 17.2 points per game. He was dedicated to getting his teammates good shots. Everyone wanted to play with him as their point guard and if you can play like John Stockton, everyone will want to play with you.
Step3: Be tenacious.
One of the toughest players to get around when he set a pick was John Stockton. He was always setting screens on bigger players and drawing fouls because they would become agitated and finally just push him down. He was also tenacious on defense and worked very hard to get the ball back.
Step4: Master the pick and roll.
The play that John Stockton was known for was running the pick and roll with Karl Malone. Every pick and roll that is run correctly puts the defense at a disadvantage. Once you know how to capitalize on that disadvantage you can play like John Stockton. You can dominate a defense and get your teammates easy shots.
Step5: Shoot accurately.
Stockton was a tremendous shooter. It was a great weapon that prevented defenses from sagging off of him. If you gave him even a little room, he could hit any shot from the three point line and in. In order to play like Stockton you need to have a better than average jump shot.