I assume that you are talking about your remote system and not the viewer or local system your connecting from. So you want your remote linux system to load VNC server upon boot?
Both systems are in my home and about 20ft apart. Just easier to use one system and remote the other.
But the system I remote to is on Ubunto 14.04 LTS... I have VNC pinned to the launcher / sidebar on the left. After bootn it auto logs me in but to start the VNC server, I need to click the VNC icon in the launcher. This is what I would like to start on boot / after login for the user, which at present is just the one set up during the install.
Hope this makes a bit better sense.