Heres How I Learnt:

Experimenting
Pulling Apart Open Source
Reading Book(Flash 4 Magic & Flash $ Bible)
Experimenting
Pulling Apart Open Source
Reading Book(Flash 4 Magic & Flash $ Bible)
Experimenting
Pulling Apart Open Source
Reading Book(Flash 4 Magic & Flash $ Bible)
Experimenting
Pulling Apart Open Source
Reading Book(Flash 4 Magic & Flash $ Bible)
Experimenting
Pulling Apart Open Source
Reading Book(Flash 4 Magic & Flash $ Bible)

You catch my drift im sure!!!
i recommend you get the Book Flash $ Magic http://www.actionscript.com