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Others have covered the feed. They also need additional light 14-16 hours to keep them in Lay.
Could you show us a picture of your Browns? Just want to check and see if they indeed sold you more than 1 hen. We won't be able to tell on the Whites, you have to watch them or vent sex them to check for the hens (actually you could do that with the Browns too, but we always like to see pictures of pretty birds).
Don't give up, the more you learn about them, the easier it gets. I have found that the Coturnix are actually easier then raising some breeds of chickens. They each have their own pros and cons. It just takes a while to get the hang of it.
edited Browns males will have rusty breasts, females speckled breast. But some (variations?) both have some speckling on the breasts and are harder to tell.