In the body of your paper, you should briefly describe the article and then offer your questions or comments; feel free to bring in concepts or ideas you have learned from the class or other courses or life itself!  Normally, the article should be at least 5 or 6 pages long, but could be as long as 100 or more pages.  You need not read the entire article and react to it, but you should either deal with the entirety of it all or at least some part to which you can intelligibly react.
You are free to quote from the article, but do NOT make your paper a cut-and-paste job, or anything where more than, say, a quarter of your paper consists of quoting or paraphrasing the article.  I want your reaction. You could write about points you learned from the article, questions that an article raised in your mind, comparisons to matters you have learned elsewhere (in this class, in another course, from life), other things the article reminds you of or that could be in some way analogized to or related to points/sources in the article.