Choose a topic that you find interesting. Write down topics that interest you, then use these topics to determine a question about that you would like answered. Narrow these topics down, and then briefly research each one. Working with more than one topic will put less pressure on you to find a perfect thesis right away, and can lead to more interesting questions to consider.
Ensure that the topic and question you have chosen are ones that you are able to find sufficient information and supporting evidence to defend. Focus on an area of your question that will be manageable for you. Try looking at the overall question about your topic, then work out smaller parts of this question that you may be able to collect information about, in order to provide additional evidence to support your thesis.
Narrow your area of research to sources that are directly related to your topic and question; looking for information in too broad of a search could become overwhelming and hinder your progress. Look for information that answers the five Ws about your question; who, what, when, where and why. Use information that supports viewpoints that differ from your own, in order to avoid writing in a biased and uninformed manner.
Develop an argument that supports your personal position on your topic and question. Try to approach your question from an original viewpoint. Express your viewpoint in a clear way that can be easily understood backed up with evidence.