Introducing new chickens

[Chickenmama1115]

First time chicken owner, and will be adding new chickens to my flock soon. I’ve never done this before, how do I introduce new chickens to my current? I currently have two barred rock pullet, a silkie roo, and a D’uccle pullet. All are five months old. I will be adding a silkie pullet that is 4 to 5 months old. And five Rhode Island red pull it that are about two months old.