What do MY students need to know before I introduce computers into the classroom?

Since I am going to be a high school science teacher, biology or chemistry, I think that computers can be integrated into my classroom immediately. There will be some areas that require work or instruction before we are able to use the computers., such as dissections or any sort of chemical activity. Other areas, such as research and video demonstrations of the topic we are on, can be used the moment my students walk into my class.