I use a dog exercise pen or a very large wire dog crate in the chicken area once the chicks are a month old. (Before a month they need to be in a box or other temperature controlled area.) Put a plywood sheet on the top so no one gets in or out. Do not put chicks in with adult chickens, they will kill them.. When the chicks are getting some decent size and feathers on them, let them out with the adults UNDER SUPERVISION for a few minutes everyday, with the periods of together time longer and longer. after 3 or 4 weeks where the pen or crate has been in your chicken yard, and the hens are no longer interested in the chicks, leave the crate door open. The chicks will stay in the crate together for safety and will eventually venture out. Usually in a few weeks, they will not return to the crate and then they are acclimated together. There will still be pecking order issues, but the youngsters will learn how to stay out of the hen's way. And you should order straight pullets, not roosters. roos are trouble makers.

You will have to waite till they are at least 4-5 months of age this way they are able to escape any danger and be big enough to be on there own, plus when you get these birds they will have an order of their own once they reach adult hood at 4-5 months set them out with the rest of the flock they will stick together untile they become use to the rest and then all the bids will be happy together. If you have a large enough area you could release at 3 months but 4-5 is much better. For the roos do sell or give away since if you have more roos they will harm each other and do some damage to the hens.

There is less likelihood there will be fighting if they are chicks. You'll just need to put them in the pen together and keep an eye on them. You will need to remove the roosters though, when they get a little older

Have the older chickens ask the new ones to lunch

I am expecting 8 baby chicks I am guessing about 4 hens and 4 roosters but I'm not sure if I have roosters I will sell them because I already have 1 rooster and have 4 hens but I want more hens what will be the best age and time and how to introduce them all to each other? The other chickens I have are all from the same batch and are about a year old.