Actionscript is most similar to C++ (and Java, by extension). If you don’t know these languages at least on some kind of level (if you can’t make a “diamond” in these languages), read a book on them, learn their syntax, and then go tackle Actionscript.
If you want to go for game design, don’t be a stickler for Actionscript, though, especially if you’re shooting for standalone applications. For windows executables, you’ll most likely want to work with C++ (because “compiling” shits out .exe’s).
Actionscript is mostly an extension for Flash, introducing the flexibility of fully procedural, object-oriented scripting to Flash. Nothing more, nothing less. If you don’t have a foundation on using Macromedia Flash, don’t go for Actionscript unless you’re working with someone who knows Flash (and its animation system, of course).
That said, DirectDraw/D3D/OpenGL extensions for C++ are a good way to bring a graphical interface to your programs.
…of course, for maximum efficiency and maximum laziness, you could always make your application in Fighting Game Maker or Multimedia Fusion. Maximum scripting, sprite building, minimum coding.
If you make an entire website where all you do is center orientate a flash applet, you are an asshole of the highest caliber, and you and your quasi-Web 2.0 friends can die in a fire.