While there are a number of videos around on the basic use of Rigify to create a control rig for your character. I noticed that a lot of the time, when it comes to setting up the eyes, that was mostly missed or covered in a single throw away line.
So, after replying to a post on this forum about how to do it with just a couple of screenshots, I thought a more complete video could be useful.
As such, here it is.