I would not sell any chicks from them if it were me because you will not know until they feather out who has lacing. I would breed them and then raise a bunch of chicks. Keep only the chicks that are very easily autosexed. Cull the rest. Then out of those you keep, keep only a couple who feather out the best. Then cull the parents.
Now you have more dependable breeders.
That's how I started and I put a LOT of RB in the freezer, but I firmly believe you have to assure yourself of what you have before you can begin outcrossing. Otherwise you will be able to be confident about the quality of the chicks you are producing.