To install with no screen install the 64 bit os with ssh enabled with password and WLAN enabled and also with ethernet cabel (hängslen och livrem)
finding the raspberry pi:
ping raspberrypi.local
then obviously:
ssh pi@192.168.xxx.xxx
To install docker on your pi is as simple as
curl -sSL get.docker.com | sh
Only allow connections on ssh, http and (https?) ports...
pi@raspberrypi:~$ sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
pi@raspberrypi:~$ sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
pi@raspberrypi:~$ sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT
pi@raspberrypi:~$ sudo iptables -A INPUT -j DROP