Styling a Html unoredered list with Css?

I was just wondering if anyone could help me understand better how to style an Html unordered list using Css, so for future use I'll know how to do it. What I mean is break down the structure of the Html unordered list & how to target & style each element of the list using Css. How to float the list “left” or “right”, how to put a space between each link, how to move the list up or down my page & how to add a rollover graphic to each link in the list.

If anybody knows of any online video tutorials that will show me how to do this, that would be great. If anyone can tell me of any tutorial videos to download that show a beginner how to manipulate graphics with Css & add that professional though, that would be great.