I'm sorry in advance for my "frenglish" mistakes!

I'm very new to ASP, I just created my first cartoon, but for now, my main character is only facing camera. (http://www.youtube.com/watch?feature=pl ... 6mf6_cTX9g -> no subtitles yet, if you're still curious)
I have noticed that, as in many softwares, there are different ways to do the same things.
So I would need some advises or links to tutorials in order to do different sides to my character and switch them properly in animation. Are all the faces systematically in different bone-layers? can I keep one part of one side and integrate it in another side, without having to copy it? etc..
Thanks in advance!
François