When you search for information, you don’t need to settle for the first search result(s). Browse and/or narrow down the results, then make a selection of potentially relevant material. Look at subject terms and keywords assigned to articles, and read abstracts and conclusions. For books: read the details provided by the catalog/database, scan section/chapter headings if available. Locate potentially relevant material (this may mean a trip to the library for a print book or journal article) and determine whether or not it's useful for your paper.
Work through the following checklist when evaluating the sources you have selected to decide whether it is suitable to include in your work.
Take a look at Purdue OWL's Evaluation During Reading for more questions to ask as you evaluate a source.