Contact a librarian whenever questions arise. Quick questions can be answered via email; more in-depth questions can be handled best with an appointment.
Work on your project consistently each and every week, so that materials have time to arrive from other libraries and we can answer your questions when you still have sufficient time to thoughtfully revise your work.
Seek out a variety of sources: books, essays in books, journal articles.
Use a variety of search tools: Primo, multiple databases, sometimes even Google Scholar. If your topic is interdisciplinary, take a look at related subject guides to find broader research tools.
Keep careful notes on all of your sources and use a citation management tool such as RefWorksor Zotero. If an online knowledge management tool is not for you, make sure that any system that you do use is thorough.