First off, some hens make better mothers than others and you never know how they will do until they do it. When you find a good hen and she hatches, you have to move her to a brood pen or you will lose poults. Everything wants to kill the little guys-chickens, other turkeys, cats, crows..... . I build nest boxes in safe areas like where they roost which is closed off to preditors.
I leave mine in the brood pen for about two weeks and then I start letting them out for an hour or so a day. This is mainly for the hen rather than the poults. As time goes on you can start letting them out more and more often. I have a batch now about ten weeks and they stay out all day but, they don't travel far from the brood pen where their water and food is kept. At night they get locked up. By the way, the hen is setting on six more eggs in the brood pen.