I need a crash course in iMovie (mac)

I need to use iMovie for video editing and I have never seen it before. I need to learn about the effects, editing, adding sound, basically everything. Is there a good online guide out there or a book on the current version that would help?

I know the best way to learn is to play with it but it seems I don’t have access to a lot of the functionality so I’m clearly doing something wrong.

I’ve heard good things about this video training:
http://www.lynda.com/iDVD-5-tutorials/imovie-hd-essential-training/175-2.html