Patrick Lowenthal and I shared design guidelines for infographics based on the results of a research project in the following article and presentation:
Dunlap, J. C., & Lowenthal, P. R. (2016). Getting graphic about infographics: Design lessons learned from popular infographics. Journal of Visual Literacy, 35(1), 42-59. https://doi.org/10.1080/1051144X.2016.1205832