I am creating a spreadsheet and some charts for a doctor.

He has shown me an example of what is looking for. He has shown me a
medical chart which looks like a line graph. Although the line is thicker
and "squiggly" (for lack of a better word). It looks like the lines on a
polygraph machine. I've seen this graph a lot when seeing medical graphs.

How do I bring in custom graphs for various industries? Where would I go to
find custom industry graph templates? How do you make a custom graph to use
outside of the charts that come with Excel?

Thanks.