Many of your information communities will require some creative thinking when it comes to finding scholarly sources for your paper. For example, it is unlikely that there will be many peer-reviewed articles on Persian cat fanciers specifically so think of this group in a broader context (hobbyists, pet owners, pet ownership). If it is a group that socializes only online, "virtual communities" is a possible search term. As you can see, you will need to draw parallels and extrapolate in order to find the peer-reviewed articles you'll need. Below are the best resources to start your research.
Librarians at the King Library have created over 80 research guides on a variety of topics and disciplines. Is your information community World of Warcraft gamers? Take a look at the Game Studies research guide. This is just one example of the many subject-specfic guides that can help you with your INFO 200 research. Use the search box on the Research Guide listings page to see if there is one on your topic.