How best to raise chicks to keep them tame and comfortable around humans and what about broody raised chicks?
~ first of all, if you don't really love your birds, they won't ever be really tame. Not saying they all need names and you have to hug them and squeeze them and "love" them, no. But if you really do care about what happens to them, it'll be A LOT easier to tame them.
I won't say all the details about what I do to tame them - handle them gently, give them treats, etc etc.
Our second year raising chickens though, most of the EEs were pretty sickly. Me and my sister would put on big sweatshirts, bring them inside and let them crawl up our sleeve or chill out in our hoods

we used this "mother hen" "technique" a little bit this year, and for the few chicks we were consistent with are becoming quite friendly. And the two year old EEs we still have from last year will all try and cram 6 or 7 chickens on my lap at once!

As to broody raised chicks, in my experience it depends largely on tewo things: if the mother is tame, and the breed of the chicks. Calmer breeds like brahmas, cochins, OEGBs, etc, are quite easy to tame, whereas broody raised leghorns might never become fully tame. And if the mother is tame, and she shows her chicks that humans = treats and safety, they will tame down much more easily.
- How do you tame an adult bird?
~ I haven't had too much experience buying adult birds due to the risk of disease, but I would keep them in a small coop/run so I could easily catch them, and give them treats such as mealworms and apples.
- What about cockbirds? How do you establish the human vs cockbird "pecking order"?
~ OK, the whole " show em whos boss" thing doesn't work. Especially with cocks that are already aggressive/fearful. It validates the "fact" in their minds that you are a threat to them and their hens. They are significantly more difficult to tame than hens, and IMO never should be completely tame. If they are just slightly skittish around people it makes them less of a threat to people. Once a cockerel reaches manhood and starts crowing, trying to breed the hens, etc, I avoid handling except occasionally. Maybe once a day, sometimes not even that.