Behavioral Health Handouts

I am in the processing of hiring a graphic designer to help me create psychological educational materials that can be handed out to clients. I would like to visually summarize and show some importance concepts that I think would be better understood through visual means rather than just hearing a verbal explanation. I would preferably like to hire someone who feels comfortable with some medical terms (e.g. nervous system) and feels interested in helping people achieve greater overall health. I know the information I would like to present and I would like guidance on the best way to present that visually.