Here are some tips that might help...
1) Turn on the onion skin effect(second button to right from trashcan on timeline). Onion skin will make Frame by frame animation much easier.
2) Use as many layers as possible. It will give you much more control over animating.
3) Use layer folders to organize related layers.
4) Use a flash camera. PM me or email me at danielzabolotny@gmail.com for the camera.
5) Layers work as they would in real life. Whatever layer is on top, will appear on top on the stage.
6) Frequently preview the animation, to make sure its going correctly.
7) Animate at a higher framerate. I use 24fps. On the internet, the flash gets slower, so a high framerate is necessary.
8) Save frequently, because Flash crashes a lot in Windows.
I hope these tips have helped you.
Here below is a screenshot of what my workspace looks like, while animating. I use Flash 8.
