I just got a Pi and am interested in setting it up and getting started, but I don't have physical access to the router or an ethernet cable. Is there any way I can connect it to my Mac and get started that way?
You can setup the Wi-Fi completely headless. As stated on The latest update to Raspbian you can provide a
wpa_supplicant.conf on the /boot partition to setup the Wi-Fi. Don't forget to also create an empty
ssh file to be able to actually access the pi as mentioned in A security update for Raspbian PIXEL.
Then you should be able to find your Pi on the local network. You can try something like
nmap to scan your local network.