Can he form all his letters well? If not yet, then start there. A row of letters carefully done will be a challenge for many 6yo’s. Once he has forming all the letters down, then you can start with very short copywork phrases. I used to have a list, I’ll see if I can find it. But yes, your goal is nice work done in a certain time period, more than it is getting a sentence “finished” Whatever he can do without being very frustrated is what you want to begin with. Many young boys are pretty easily frustrated when learning writing, it’s a hard fine motor skill for many.
Narration can be done many times a day. I expect at least one per day while learning the skill, moving up to narrating most of what we do during the day. Obviously some things are more “fruitful” for narrating than others; some things can be done in a sentence or two. Again, you are skill-building without driving him “bonkers” so if it is hard work for him, concentrate on a couple of the readings or things you do, then as it becomes more natural for him you can expand.
Michelle D