Sprite Shets

What is a sprite sheet -  http://www.codeandweb.com/what-is-a-sprite-sheet

This video show one method on how to take your sprite sheet and covert it into a movie clip.

Creating sprite sheets - http://www.codeandweb.com/texturepacker/ or if you are using flash CS6 http://www.adobe.com/inspire/2012/12/ten-steps-flash-cs6.html

Using the sprite sheet in Flash.

https://www.youtube.com/watch?v=88elv13HUU4

Using cut and paste on a sprite sheet

Using a swap 

http://www.basearts.com/curriculum/ADOBE/~Animation%20-%20NEW/FL_howto_sprite_sheets.pdf