The Census' NAICS page lets you do a keyword search for your industry on the left hand side of the screen or browse the Classification system.
Newer industries may not have a NAICS code yet. Social Networking, for example, were added to the 2017 NAICS and were not previously a recognized industry.
The North American Industry Classification System (NAICS) is the standard for classifying business establishments and groups them according to similarity in the processes used to produce goods or services.
All industries will have at least one associated NAICS code from broader (2 digits) to more defined (6 digits).
For example:
Use NAICS codes help you to identify competitors and find resources that will tell you more about your company's industry.
Industry associations advocate for their members and their industry. Search for association websites to see if they provide any data that may be useful for class projects.