To animate your sprite it will need to have more than 1 costume. Pico the sprite I used comes with 4 costumes and many of the other sprites provided also come with multiple costumes. You can also draw the sprite but the costumes will need to look like the sprite is walking (or what ever movement you want). The script is pretty simple it is just a wait block and next costume block inside a forever loop. If you want the sprite to move across the screen simply add a gliding block!
I hope you find this useful if you need any more help just ask!! :)