This video covers the headless initial Raspberry Pi setup
Raspberry Pi Imager:
https://www.raspberrypi.org/software/
Raspberry Pi Headless Documentation (wpa_supplicant.conf):
https://www.raspberrypi.org/documentation/configuration/wireless/headless.md
Raspberry Pi SSH file configuration (see section 3):
https://www.raspberrypi.org/documentation/remote-access/ssh/README.md
Raspberry Pi IP Address Information (in case you cannot connect by using the raspberrypi name):
https://www.raspberrypi.org/documentation/remote-access/ip-address.md
