Do in boot partition
====== Enable ssh ======
<code>
touch /path/to/boot/ssh
</code>

====== Configure WLAN ======
create File wpa_supplicant.conf
<code>
network={
  ssid="networkname"
  psk=xyz
</code>

====== user ======
userconf.txt
content
user:pw

From https://www.raspberrypi.com/documentation/computers/configuration.html#configuring-a-user