[@Nytefall]
They're a species, remember that.  No need to have one way of life for them.

As a way to think about this, think of them as a species and what species universal traits they have and than make a focus Civ for them.  That's why I get bothered when you call them a race as that implies they are more homogenous than a species.

This is important as all species are public domain, so it is important to know what they are like as a species.  It is assumed that you have NPC cultures alongside your focus Civ that are less developed in every case as they're a species strewn around the world you have them inhabit.