Hi There! Sounds like a fun project. Do you have an idea of what size you would like it in? I can picture a colourful infographic with some engaging images, colourful text and designed in a fun layout. Not just left right, right left, but rather showing the timeline flow itself as well. As a professional graphic designer I'm more than qualified to help! However, I wouldn't recommend photoshop, rather illustrator (compatible with photoshop) as it allows more flexibility. Send me a message and we can chat further!