If you still need help, you might want to try this:
Create a shapetween of some shape growing to a bigger shape [the shape has to have an _alpha, let's say 20.
Then duplicate the layer and let the shapetween on the duplicated layer begin one or 2 [3 if you want to
] frames later.
Do this untill you've got 5 layers or more/less if you want to.
This looks a bit like the "softenfilledges"-thing you can do with shapes, but this one's in a dynamic invironment....
Experiment with it, I don't know you'll find it helpfull, but I'm afraid the only way to find it is trying....I used it when I was making a sore on an arm [it's my idea, whiehoo! :P don't know if anyone ever did it before though]....
Good luck - Ruben
PS. I'm 16 which is pretty young as well, I started out when I was 14. We're the future, right?
PS2. IOWA rules! Slipknot are from DesMoines!