I hope the black ones are pullets as they are my favourite, although the white ones are good looking too. What about the greyish/white ones in picture 2?Yes, the gold chicks are the brown looking ones. Yellow chicks are ones that have yellow down at birth and then grow white feathers.
So your reddish colored chicks are pullets and your white feathered chicks are cockerels, if they come from a gold based father and a silver based mother.
As far as your black barred chicks, I only see one in the photos, and that one appears to be a pullet at this point. Do you have more than one black barred chick?
I've only got one picture with the two black ones, but it's a bit blurry: