New to User Forms

Hey everyone! I have just a few lines to write and I would appreciate if anyone could help me. I just started on a IRC-client for a school project and thought it would be a good idea to use User Control for a few things but the thing is. I have never used User Control´s before and I havent found any good guide lines or tutorials that can help me. If someone could give me an example or explain to me how it works or just give me an URL to an homepage that explains it in a good way I would be very gratefull. /Patrick