How do I print a sample of all the fonts on my mac?

Open Font Book in Applications.

From the Font Book Sidebar select All Fonts, then select all the fonts listed [Command - A]:

Press Command - P or from the Menu bar > File > Print, to open the print dialog window:

This should default to Font Book [highlighted above]

Adjusting the point [pt] Sample size will reduce or increase the number of pages required for your report.

There are three options available for the Report Type,

Toggle to select:

Catalogue would be the obvious one to select if you only want samples.

Reportoire & Waterfall may produce multiple pages for each font, depending on variations.

If the print dialog window opens a smaller window without any of the options given above,

Click on Show Details to expand the window: