To do research for this paper, you're going to focus on one database: Opposing Viewpoints in Context. This database has a whole section devoted to the issue of online education. Within this section, you'll find many different kinds of resources that deal with the pros and cons of online learning.
That link will bring you to a page that provides lists of different types of sources that all address the issue of online education. You can also use the "search within results" box to search for something more specific about online education. For example, you might try searching "community colleges" if you want to investigate how other community colleges are approaching online learning. Click on the title of a resource to access it. Once you've done so, you can use the "cite" button at the top of the page to generate an automatic citation for that resource to add to your works cited page.