It's all about the roo as far as sex linkage goes. Have you looked at the charts on the Sex linked information thread? Of course BR roo over BR hen = BR chicks, the males will have a prominent head spot. Females, not so much... if at all. Females will have darker feathering, and darker legs. RIR roo over RIR hen = RIR chicks. In some lines the males can be identified from the females. You'd have to do some research on that. Now, for sex links: RIR roo over BR hen will give you black sex linked chicks. Unfortunately, you may not be able to tell the difference between the sex linked chicks and the BR chicks.Cute!
Im still learning which situations give you a BR, a black sex link, a red sex link and a RIR. We are hatching more today and I don't know what's what since the eggs came from a farm with BR and RIR roos.