I can't explain it much better than Mike did (great stuff there btw, Mike), but spend time, be careful about the animation. If you are a beginner, of course you shouldn't be trying t make it look like a disney animation, but try harder.
What I think you did was you downloaded a free trial of flash, look at a couple tutorials, and tried to make something in a good ten minutes. That's not how to do it.
Flash isn't just about tutorials, it is about experience, and the want to animate. If you look at thirty tutorials on animating, and one hundred tutorials on coding, I can guarantee you your game is gonna suck. Bad.
Before asking people if your animating skills are any good, play around with flash for at least three months. Buy it, don't just use free trials, and for the love of god, don't bothering trying to learn how to animate if you are only going to spend an hour every five weeks with it. I'm not saying this is what i think you will do, I am really not, but I AM saying that if that WAS your situation, give up flash.
So in conclusion, buy it if you really want it, spend a lot of time with it, and practice. See that word in bold? Means it is important.
if you think a good twenty minutes locked in your room will give you a flash similar to the quality of, lets say, Blockhead, no. You are wrong then.
it takes time, so if you are too impatient, then don't bother. But if not, practice, practice, practice! I can't stress that enough.