Outside of animating, this is where I spend the most time and really in some cases is the hardest step. At this point you know the style for the video but you have to start thinking about how your video is going to move. I like to storyboard out the entire video before animating. This helps me and the clients I work with see what the video is going to look like before getting into the animation. Seeing it all laid out in front of you makes it a lot easier to make changes during this stage rather than later once you already started animating.
I recommend breaking the storyboard process into two parts. Pencil and computer.
First get a storyboard template and a pencil and sketch or doodle what each frame is going to look like. Don’t worry if you can’t draw, they don’t have to look nice they are just for you to get an idea of how it’s going to move and what needs to be on the frame.
When I’m going through a script I like to take each sentence or every half sentence and make a frame for them. You usually end up with 20 - 50 frames depending on how long your video is and how many scenes you want to have. Being creative with your scenes is tough. It’s often hard to visualize how the video is going to move from one scene to the next without just cutting from one to the other. Try to avoid just cutting from each scene to the next and think about how you could make the transitions more interesting and have fun with it.
Once you have all your scenes sketched out on a paper, now you can jump back on the computer. You now have an idea of what every frame or scene needs to look like so it makes designing all of them in your style a little quicker since you don’t have to do as much thinking and worrying about the movement.