I start the process at 5 weeks. While the adult birds are out free ranging, I close the door to the run, and open the pen the new birds are in. I let them explore the coop/run, figure out where the food and water is, stuff like that. Week 6 is when the true integration begins. I open the pen again, and the little ones come rushing out while the old ones come rushing in, trying to get to the baby food. So the only adult birds left in the adult coop are usually the lower ranking birds, which accept the chicks with only a few serious pecks. I do these short interactions for a few more days, and then one night I leave the pen the little ones are in open. By morning I usually find them hanging around the back area of the adult coop. I let the big birds out to free range and let the young 'uns explore. By this point we've reached week 7, where i open the baby pen for good. Attacks, pecks, chasing, are all very expected things, and as long as they're not excessive (as in drawing blood or targeting a single chick) I let them be. My first post was more intended to answer the question of what establishing the pecking order should look like, sorry I didn't understand what you were asking