Considering that there are at least 2 cockerels in the group, keep them on a grower or flock raiser type feed. Don't offer layer, as it's strictly for birds that are actively laying. When they get to be about 18 weeks, set out a separate container of crushed oyster shell.
Production Reds are very good layers of large brown eggs. They aren't quite as prolific layers as red sexlink types (cinnamon queens), but they are still top-notch layers. And they aren't quite as prone to complications in their laying systems.