It is very simple with that hardware, you can install openHAB by using the Armbian built in scripts, but this does not install frontail, samba and the other stuff that is handy to have to the same that openhabian uses to make support easier.
Your welcome to use the scripts I used to setup mine which will install this extra stuff… The only change I have made is to switch to a 64bit java and have not yet gotten around to updating the script with this 1 change, which can be done after the script finishes and the openhabian scripts can be used to update the java with very easily. This script will install the openhabian script if you want it to…
Guide: How to Install openHAB 3 under Armbian - Development - openHAB Community