I Need A Hint
SPOILER ALERT!!!!
The following code demonstrates how to build everything but some things are commented out, and it's up to you to experiment to get it working. Log into https://editor.p5js.org and duplicate the example in your own account, then play with it until you can get it working! Click on File->Share and open the link to run it in a full window.
Good Luck
Don't worry if you can't complete the task. Keep trying in your own time. It's fun!