Step 1: Research the Topic
Are you familiar with the topic?
Who is your target audience?
What is the main idea you need to share?
What kind of data do you need to illustrate the topic?
Research!!!!! Collect as much information (meaningful information!!!!) and data as you think is necessary. Look for images, other infographics that already exist on that topic, statistics, charts, symbols or icons you might want to use.
Keep all sources so you can include them as credits.
Step 2: Data processing
Sort and organize your data.
Simplify text to make it easy to read and process.
Break your data into "chunks".
How many units ("chunks") do you have?
Highlight all important points - you might want to emphasize them in your design.
Please keep the reference information to include in your footnotes.
Step 3: Storyboard
Organize your data in the order it should be presented.
Create a powerful headline.
Decide if you need a header for each unit.
Does your presentation have a flow?
Which units will require graphics to support the data?
Step 4: Wireframe

Wireframe your story before you start any design work.
What type of infographic do you need to present the data?
Sketch out the structure of your future infographic..
Step 5: Design Layout
Experiment with design ideas by creating rough concepts that visualize your data in different ways.
Explore layouts that would fit your wireframe (research!!!).
Create your own layout for your specific data.
This is the time when you create a file in Adobe Illustrator (11x17).
Import all graphics you have so far into Illustrator.
Create shapes, lines, text areas and image holders. Arrange them to fit your idea. Use shapes as backgrounds for your units. You can make them as simple or as complex as you see fit.
Spell check prior to pasting the text.
Keep graphics and text blocks on separate layers.
Ensure balance between text and graphics.
Utilize white space.
Align all elements as you go. Use smart guides, grid and guides.