Over the course of creating your argument, you'll to prepare a few tools, organize your files and use a few templates.
Get started by doing the following:
Download and get familiar with a reference manager like Sente to keep track of your references.
I would also recommend an outlining tool like OmniOutliner -- this will allow you to summarize sources and create and rearrange outlines quickly, which you will need to do at various stages. You can use a word processor for this, but it's not as nice.
Setup VPN so that you have Northwestern access when searching academic publishers
Create a folder on your computer called "Lit Notes" (or something) where you will save all your summaries of different sources
create a copy of this google doc from this Lit Review template
The material from this guide is taken from Arguing from Sources -- a book for college students on how to do a literature review based on a task analysis of an expert researcher. Unfortunately the book is out of print, but fortunately you can use this scan.