Articles come in many forms. Newspaper articles, which you may have researched while finding primary sources, are often primary sources. Magazine and journal articles are typically secondary sources, and they are great to reference when you are researching. Depending on when they were written, some magazine and journal articles may be primary sources, too.
It is best to wait to search for articles after you've done a bit of research on background information and in books. By now, you'll have a better idea of what you are looking for.