The Gale in Context Literature Resource Center is probably the easiest database for you to start your search for literary critiques and author biographies. It divides your results into the categories of Literature Criticism, Biographies, Topic & Work Overviews, Reviews & News, Primary Sources & Literary Works, and Multimedia materials.
Unless you specify otherwise, GIC LRC will search multiple content types and arrange your results by Relevance in these divided categories:
Topic & Work Overviews
Reviews & News
Primary Sources & Literary Works
All of the articles are full text online. GIC LRC will also show you how to cite the article in MLA format.