Suggestion is to grab some sample FLA movies from
flashkit.com --> movies, open them up, and dissect them. Start off with the simpler ones so you can grab the key concepts. There's tons of tutorials on that site and there's a forum there with very knowledgeable people. That's how I got my start a few years back. Takes a ton of time and patience, but stick with it...
The ability to turn creativity into reality on a digital canvas to share with everyone is extremely satisfying. Flash can do anything you dream up. Also look into Swift3D for 3D effects for Flash. Swish is good for text effects.