There is really no easy way to teach how to make games in Flash. Understanding the methods available in Flash is the key. Once you understand how the basic methods work,ie.. gotoAndPlay,for loops, variable definitions,etc... the rest is just figureing out what you want to do. I do have a very nice tutorial by Dean Angerer that explains many of the things needed to learn to make Flash games...
A mind once stretched by a new idea never regains its original dimensions.
- Oliver Wendell Holmes