John, here is a link that will give you an overview of how a turbocharged engine works and all the parts that are different from a normally aspirated engine. Hope this helps you out with basics, this is a website I used when I was in school for automotive technologies. I dont know how much you know about engines so please dont take this as an insult I'm just trying to help you gain some knowledge down to the very basics.
http://auto.howstuffworks.com/turbo.htm
