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Generate your draft topic idea. The reason it's a draft is because you may refine your topic at any point in the research process depending on what you learn about your topic or the results you retrieve.
Based on your search results, make a list of keywords that are used for your topic, and generate a list of alternate keywords. Are there multiple terms that could be used to describe the same thing? That will be useful when searching for resources.
Evaluate the resources you are finding to determine if they are reliable but also if they are relevant to your topic. If you are finding many resources on a different theme you may choose to refine your topic again, or you may choose to revise your search strategy to find more relevant resources.