Your introductory paragraph has to state your thesis. What is your opinion on the topic? Do you think that computers are good or bad for children? Are you in the "youth" category? If so, how do computers affect you and your friends? If not, think about children that you know. Are computers good for them?
One bad thing that computers and the Internet have done is encourage people to cheat, be lazy, and look for the easiest way out of any situation. One good thing that computers have done is make it pretty easy for teachers to enter suspect phrases into a search engine to find out whether their students have stolen work from the Internet.