Creating hand-drawn and scribbled graphs and charts

Hi All,

I am looking for way to create hand-drawn looking graphs, figures and shapes. I saw an article with some nice examples, that are spot on what I am looking to learn to do for a project of mine. I just can’t find any guides on how to do something similar. I even wrote the author, without luck. Anyone who can point me in the right direction? I am guessing illustrator, but not sure. For context, I have a beginner’s proficiency in Illustrator.