A lot depends on how much room you have, but if you don’t have enough room for a Mama hen to raise chicks with the flock, how do you plan on integrating them later? That normally takes even more room than a Mama and chicks. It can get a bit rough with limited space.
Broody hens have been raising chicks with the flock since there have been chickens. Ancient Egyptians were incubating eggs and then raising the chicks in a brooder thousands of years ago. I don’t know when people started isolating broody hens and their chicks from the flock but that has probably been thousands of years too. There is no right way or wrong way to do this, just the way we choose.
There are benefits and risks any way you go about it. I like a broody hen to raise them with the flock so she can handle integration. That benefit outweighs any risk I see. After she weans them they have to handle their pecking order issues by themselves but if you have sufficient room, this is not a big problem. If space is tight, it can get rough.
What normally happens with mine is that Mama brings them off the nest a day or two after the hatch is over. Sometimes that is only 24 hours after the first chick hatches, sometimes it can be three days. Mama knows when the hatch is over, she will handle that for you. I have food and water where the chicks can reach it after they come off the nest.
Mama normally keeps them in the coop a day or two after she brings them off. Then she takes them out of the pop door to the run. After that, they spend practically all of the day outside. At night, she brings them back into the coop where they go to a corner to sleep on the floor. Of course there are some variations to this but it’s pretty typical.
My main coop is 8’x12’, my main run is 12’x 32’, and I have an area 35’ x 90’ feet in electric netting they can roam in. Room is not a problem with my flock. I’ve never lost a chick to another adult flock member.
If you decide to isolate the broody and chicks, which many people do, be careful picking the broody up. I once crushed a chick that had crawled up under a hen’s wing when I picked the hen up.
Good luck!