OneSearch, the all-in-one search of articles, books, and more, is a great place to start. A search in OneSearch can tell you if you have a topic that is too broad or too narrow, or if you need to refine your search terms to get better results.
There are lots of ways to find articles. Where you look first will be determined by the kind of information you need. Read the description of each database to find out what types of information the database contains.