Bare Minimum
I'm sorry but I can't give this a passing grade. If you're going to make a slideshow rather than animate something that's fine, but you'll have to have better drawn slides otherwise it's not enjoyable. I get the gist of the story, but half the time I can't tell what I'm seeing.
As for the play issue: there are some Youtube videos explaining how to make a "button symbol" and a short bit of code to type in the "actions" tab to get it running.