I do not like any production type breeds. Especially Sex-links. My birds are my pets. I don't like seeing them suffer repro issues at young ages due to them being bred to be disposable egg machines.
Oh gosh, I'm not sure. I would imagine each hen should lay between 5-6 eggs a week. They may slow down in the winter or during molt. If they go broody, they will stop laying as well.
I don't feed organic, I feed Flock Raiser. So can't help you there.
You can't sex by behavior this young. Saddles don't come in until around 12+ weeks. Spurs usually don't start getting any sort of substantial until they're close to a year or more. Older hens can also have spurs.
Before 12-14 weeks, you can really only go by comb and wattles development. Along...
Look at your Orps. See how their comb and wattles are so small and pale? They look exactly as they should at their age. A pullet will not have large or bright red combs or wattles until they are getting ready to lay eggs. Every now and then they will have slightly large red wattles, but the comb...