Hi Gary, welcome to BYC!
If you'd like some help sorting out which breeds might work best for adding to your flock, check out this article in the Learning Center:
When you do get new birds, remember to isolate them for 30 days to be sure they are disease and pest free. Then keep them where the new birds and your existing flock can "see but not touch". That will give them all a chance to meet before mingling and there should be less of a struggle establishing a new pecking order.
Feel free to ask questions, there's a lot of information here and a lot of helpful members.
Good luck, thanks for joining us!