There are four basic functions that you use to to control Simple Sprites:

       GetSprite()  Attempts to allocates a sprite for exclusive use
    ChangeSprite()  Modifies a Simple Sprite's image data
      MoveSprite()  Changes a Simple Sprite's position
      FreeSprite()  Relinquishes a sprite so it can be used by others

To use these Simple Sprite functions (or the VSprite functions) the SPRITE
flag must have been set in the NewScreen structure for OpenScreen(). If
Intuition is not being used, this flag must be specified in the View and
ViewPort data structures before MakeVPort() is called.

 Accessing A Hardware Sprite 
 Changing The Appearance Of A Simple Sprite 
 Moving A Simple Sprite 
 Relinquishing A Simple Sprite 
 Controlling Sprite DMA 
 Complete Simple Sprite Example