1: What do you mean by cover? Title screen? There are plenty of examples.
2: I assume you want to display a sprite, though you could mean actually drawing them.
The basic command is SPSET. Type a command and hit the blue ? on the keyboard panel for help info.
>SPSET (1): Creates a sprite (using a definition template)
>>SPSET Management number,Definition number
SPSET 1,500 'oh no a sprite