Hi Mary, glad you joined the conversation with your wisdom.Back to your first post: avoid that RIR cockerel, he's already not nice, as are many hatchery bred RIRs, in my experience. Cockerels who avoid human contact are more likely to turn out well, while 'friendly' cockerels can be bold and human aggressive later.
Each one is an individual, and it does take experience, and being willing to cull, to get the ones you want to live with.
You have an amazing mix of hens and pullets, so many possible choices for breeders, should be interesting and fun to see what comes out of this project!
Here we select for temperament, lack of good conformation, and size. Then color and closeness to breed standards. We don't show our birds, so 'close enough' is fine. No bird who's been sick gets to reproduce; injuries don't count, but poor health is not fine.
Mary