AC1200

> If I attach a USB printer to the USB port of the router, will the
> printer work wirelessly?

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual.  Read.  Look for "Share a USB
Printer".  "on your network" should include devices connected with an
Ethernet cable or wirelessly.

   Whether any of this stuff actually works is always subject to
verification by experiment.  If you have problems, please include the
router's firmware version in your problem description.