Some infographics which I find on the Internet looks professional, eye catching and easy to follow. Looking through many online infographic editors I found www.piktochart.com portal which allows you to create your own graphics very easily.
I won’t discuss about functionality – it’s all up what you need, but I really encourage you to create free account (paid one allows to export at higher resolutions, create PDFs etc).
These graphics were made within 15 minutes tops. Take a look: