You will find some information on the JW official website www.watchtower.org
That website does show some of the ways they control people including children, however be aware that this site is softened for the non-jw reader.
However check out this article about after school sports http://www.watchtower.org/library/g/2002/12/8a/article_01.htm entitled "Childrens Sports - The New Epidemic of Violence" which takes some facts and scrare mongers so that JW children are "advised" not to participate.
Some parents have thus concluded that organized children's sports tend to fuel an unhealthy spirit of competition. This does not mean, however, that their children do not get to enjoy playing with others. Many Christian parents, for example, have found that their children enjoy playing with fellow believers in a backyard or at a local park. This way the parents have more control over their children's association. Family outings may provide further opportunities for wholesome play. Granted, a backyard game will probably not give the same thrill as being on a winning team. Never forget, though, that at best "bodily training is beneficial [only] for a little; but godly devotion is beneficial for all things." (1 Timothy 4:8) By maintaining this balanced view of sports, you can prevent your child from being a victim of the new epidemic of violence.
Also as far as your idea for computer games, you'll need to be aware of this article "Electronic Games - Is there a Dark Side?" http://www.watchtower.org/library/g/2002/12/22/article_01.htm
Be aware also that JWs instill a deep fear on demons into their children. With regard to games (computer games) note what is said in this article: http://www.watchtower.org/library/g/2002/1/22a/article_01.htm
One Christian woman named Jean % purchased a computer game that seemed harmless at first. As she worked her way through the game's levels, she discovered aspects of the game that had spiritistic overtones. Before long she began having violent nightmares! "I got up in the middle of the night," says Jean, "and destroyed the game CDs." The result? "I haven't had any trouble since."
Someone else hinted at how JWs are taught to be "separate from the world". Basically JWs have the mentality that the whole world is going to die at armageddon and only JWs will survive. They'll deny this when asked, but over and over again they're told that the world "outside of JWs" is in the power of the devil. See this article: http://www.watchtower.org/library/w/2001/9/1/article_02.htm
How widespread is the Devil's influence? "The whole world is lying in the power of the wicked one," says the apostle John. (1 John 5:19) Of course, we do not want to become obsessed with the Devil or allow superstitious fear of him to paralyze us. We are wise, though, to stay alert to his efforts to blind us to the truth and to break our integrity to God. ?Job 2:3-5; 2 Corinthians 4:3, 4.
The Devil does not always use brutal means to attack those who want to do God's will. At times, he makes himself seem like "an angel of light." The apostle Paul warned Christians of this danger when he wrote: "I am afraid that somehow, as the serpent seduced Eve by its cunning, your minds might be corrupted away from the sincerity and the chastity that are due the Christ."?2 Corinthians 11:3, 14.
We therefore need to 'keep our senses, be watchful, and take our stand against him, solid in the faith.' (1 Peter 5:8, 9; 2 Corinthians 2:11) Avoid playing into Satan's hands by dabbling in anything that is connected with the occult. (Deuteronomy 18:10-12) Be a good student of God's Word, remembering that Jesus Christ repeatedly referred to God's Word when he was tempted by the Devil. (Matthew 4:4, 7, 10) Pray for God's spirit. Its fruitage can help you to avoid the works of the flesh, which Satan promotes so effectively. (Galatians 5:16-24) Also, pray earnestly to Jehovah when you feel under pressure in some way from the Devil and his demons.?Philippians 4:6, 7.
Please also be aware of the very real problem of Child Abuse that currently exists in JWs. Please look at www.silentlambs.org
JWs are, as I stated above, told to be "no part of the World" - "The World" being anything outside of the JW organisation. JWs have their own "Judicial system", so if someone sins, they are expected to confess it to men (elders) who will then judge what should be done. The problem is that there have been cases of child abuse and the Elders have simply inflicted some minor punishment upon the offender (such as restrictions in "spiritual duties") and they've left the child without counselling or help. They have not reported the abuse to the police, because the police are part of the "world" and they are protecting "Jehovahs Organisation" from getting a bad name in the public eye.
This results in a suspected 127000 covered-up abuse cases. Panorama did a program about this in 2002 see the transcript here http://www.silentlambs.org/education/panorama_trans.cfm
So if you notice any signs of abuse in any of the children who are JWs, please be aware that they're not always taught to tell teachers or police, they're told to tell Elders, who may cover up the abuse.
The Watchtower organisation has tried to correct the problem somewhat by issuing letters to congregations, however they have never retracted the main teaching which causes much of the problem: they teach that only when there are 2 witnesses to a sin can the person be punished. Therefore, when there is child abuse and only the child knows about it, and the offender lies and says they're innocent, the elders will often not act upon it at all! They'll tell the child that there should be 2 witnesses to the act and since there isn't, the child needs to shut up about it.
As you can imagine, this means that children may think that telling an adult about the abuse wouldn't help them anyway. They may have even told the elders and been told that they're lying. This is something that teachers of JW children should be aware of.
It is great that you're showing this level of interest I hope that this information helps.