You may want to try Final Cut Express. It weighs in somewhere between iMovie and FCP. There are heaps of good resources to help you get started with FCP. Try http://www.uemedia.com/CPC/2-pop/
for some help. Lots of good tutorials and knowledgable forum mediators. If you have any specific problems I may be able to help. contact me.
Jonny Malibu- 'There, there... keep trying and maybe one day you'll be 1/2 the man that I am.'
Rex- ' You sick bastard!'
Jonny Malibu- 'Bitch.'