One of the most common tools to compare and contrast is the Venn Diagram. Here is an example of a simple Venn Diagram, which allows you to show the similarities and differences between two different things.
The following GoogleDoc has three different graphic organizers that you could use to compare and contrast. Choose one that best suits your needs to compare and contrast the information that you have found.

Compare and contrast graphic organizers
If you are not using google docs, you can click the following link to get a copy you can use with your word processor: Compare and Contrast