Very easy,put the installation CD in and choose "extra conponents" or sth. like that.
But once you're done with this, it is SO easy to get infected by virus like "nimda"......
I doubt a person like you(who don't even know how to setup IIS) will be able to avoid all the attacks from the hacks on the Internet, so think it twice before proceed!
If you still want to do this, I strongly suggest you bring a friend who is an expert in security to help you out.