[quote=Bresn]
What exactly classifies as "Culture"?
[/quote]

Culture is one of those things that's hard to explain, but relatively easy to do.
Write what your people are like. What makes them recognisable? What is so distinct about them that says 'I come from such and such'? And why do they do that?
Like I said, I'm not very good at explaining it. I'm sorry I can't be more helpful.