I believe most "kids" are misguided by the "bad ass" lone sniper who took on the entire army in some move and games. I remember I used to be like that when I was younger.
There was an article th at detail qualfication and responsiblilty of a sniper in
howstuff works http://science.howstuffworks.com/sniper.htm
. While it isn't the bible to sniping, but it really show how they work without first hand experience