Introduction to computers Help!!!

I've to condct a class to my fellow office staff about the the above topic. Even though I'm in the IT field more than 5 years doing a class with the above topic is very hard to me. Can anyone give me some rls where i can information and some sample chapters about the intro to computers? I've gathered some info but I need to know how to approach them and teach them in a good manner with the very basics to get them into their brains So if anyone can help me to find the data for hat It will be a great help. Thanks in advance for anyone supporting to me