Databases like the ones below contain both primary and secondary research. Primary research articles, what should form the bulk of your literature review, should have these parts: introduction, hypothesis, literature review, research design, methodology, results and findings, conclusion. Quantitative articles are recognized by statistical analyses of results.
Using the keywords you've identified from your topic sentence, search for articles in several databases. Databases will have different interfaces, different vocabulary, different content. They do have many things in common, too. They usually have a way to save articles (very useful for subsequent visits), refine searches, conduct subject searching and limit to full text.
Learn advanced search techniques like boolean searching and truncation by watching the video below.
