Rather than a "choke chain", I prefer a product called "gentle leader". A strap goes around the neck with another strap that feeds through a ring and slips over the nose. Where the nose goes, the body follows. Also kinda acts like a half-muzzle and they can't chew the leash unless you leave it too slack.
When training them to obey a particular command, I follow the camp that says it's better to train them for 2-3 minutes on a command and then do something different for a while. As pups, they have VERY short attention spans. Many short sessions over time SEEM to achieve better learning. At least it worked that way with my last 3 dogs (all heelers).