Yeah, read up on TCP. Sams publishing makes good books for learning loads of computer related things, the books are usually aroung $40 so be willing to pay. Focus on things that make up the internet first, the basics I guess. Protocols are a great starting off point. And you do not have to learn the inner workings of a PC to become involved in IT. You really need t specifiy, there are so many possible jobs for somebody interested in IT. Everything has a branch, you have to specify a little.