You can also go to the list of subject guides, compiled by UBC librarians, classified by subject. Choose your area of interest from the list.
What should you read?
Read the most recent review you can find.
Use OVID or Pubmed to do a thorough literature search on your topic of interest and read as much of the recent material as you can.
Find the recent publications of authors of work directly relevant to you, and scan the recent issues of the journals that publish work in your area. Keep up to date with those authors and journals throughout the preparation of your project proposal and beyond.
Read critically.
After you have digested the literature, you may need to revisit your research question.