If you're planning on ever doing serious animation or even professional work, you better start practising doing storyboards.
Keep in mind that your storyboard doesn't have to look like a detailed comic-book. It just needs to clearly show the angle of the shot, the (important) characters and/or (important) objects in the scene as well as indicate movement of anything in the shot and/or the camera itself.
Once you have your finished storyboard, creating an animatic is quite easy since all you really need to do is put your storyboard frames together and time them to fit your scene(s). I personally like adding some movement to some frames to better show camera movement.