Your paper will have a clear introduction with a thesis. You will use the arguments presented in Glow Kids for a portion of your paper, and you will also need to find articles on affirming side. Your assertions must be substantiated by research. I would advise you to look at the resources in scholarly journals.  A strong paper will situate the conversation and narrow the focus.  The good and bad effects of gaming are broad categories and will likely not yield a strongly focused paper; however, considering how gaming can be beneficial and detrimental to academic learning would focus the discussion. Perhaps you might think about violence in video games as good and bad.  You might also write about gaming as cognitively beneficial and cognitively harmful.