Hi! We have three 12 week old pullets. 1 is a Buff Orpington, 1 is Golden Sexlink and 1 is Black Sex link... We originally had 4 but that is a different story.. And they were all supposed to be sexlinks but that is a different story as well! Anyway we love them so much we would love to add to our chicken family. We absolutely love the Orpington because she is so sweet and social we wanted to get more. How hard would it be to introduce same age Orpingtons and what is the process we need to go through to do it? We have a great coop that my husband built so there is plenty of room for more and we are new to having chickens in the family. Any advice would be great!