Questions:
How do you find the Timeline Panel?
In the bar menu, click Window > Timeline.
Are you making a frame or video animation?
Frame animation.
About your piece:
As you can see, this is a picture of a grasshopper I found on the internet, then I made it change colors. At first, I didn't like that it was just changing color and nothing else, so in the actions panel, I also implemented an action that pixelates in a polygon-like shape of pattern every time the color hue increments by 5.