Unfortunately I can't get the exercise file to render properly...just coming up with a black screen.
http://www.sidefx.com/index.php?option=com_content&task=view&id=1412&Itemid=305
It's sort of a tricky tutorial (like most everything in Houdini) but it's definitely got some high points in it and you'll learn a lot.
If anyone knows how to get the work file to render properly drop me a message in the comments section.
