Nikon has posted a couple of tips for using N-Log recording on the Nikon Z 7 and Z 6.
In addition to the tips, you can also download the N-Log Specifications from Nikon.
Note that Nikon still can't decide whether or not the space belongs in their Z-series camera names. Even though Nikon's official stance is that the names should include a space, both versions of the camera model names are listed on the Technical Solutions page.