SSH:

Create a empty file in the root of boot partition named "ssh" (no extension).

touch /mnt/boot/ssh

WIFI:

Create a file in the root of boot partition named "wpa_supplicant.conf" with the following content 

country=CZ
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="NETWORK-NAME"
    psk="NETWORK-PASSWORD"
}