Once you have a topic, build your general knowledge of it by reading one or two encyclopedia articles.
This step is not to find sources for your paper, but for you to find out:
In the articles, you will discover keywords to use in your search strategy (Step 3). Also, understanding your topic will save you time and effort when writing your paper, because you will be able to draw logical conclusions between the sources you choose.
Use library databases to find trustworthy information on your topic.