It is actually much easier to create sprites than most people think. Here's what you do:
1. Open up a photoshop or macromedia fireworks program and create a new file.
2. Set the resolution really low (I usually go around 40 pixels per inch)
3. Set the artboard size (the image size) really low, in pixels. Like 32 x 32.
4. Set the background color to transparent.
5. Open up the file and zoom in a lot, as the artboard is probably really small.
6. Select any pencil or brush tool and set its diameter to about 1 pixel.
7. Start drawing your sprite! Yay, the fun part! :)
8. Save your file to a .PNG (it has to be a .PNG because that's the only flash-compatible,
transparency-enabled bitmap file format.)
9. Import the sprite into your version of flash and make your own sprite movie / game, and have fun!
Here's an example of one of my sprites:
(*note* if it appears really small, then its resolution is goofed up.)