Below are links to some websites that will help with comparison/contrast papers:
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Before you start writing any sentences, you need to brainstorm all the ideas you can in an organized way. The use of a T-chart or a Venn Diagram is helpful -- http://www.enchantedlearning.com/graphicorganizers/ -- so that as you brainstorm, you also begin to organize your ideas.
Once you have completely brainstormed for ideas from these items you've read, then you'll be ready to write an outline and a thesis statement.
Let us know what you come up with.