I only currently keep two chickens as a starter flock right now. I wanted to start small, as I've never kept chickens before and didn't want to get overwhelmed. Now I feel a bit more confident and feel like I can expand to another hen or two. If I do decide to get another hen or two, what is the best way to introduce them? I'm looking to get hens around the same age as the two I already have - about 4-6 months or so is the age frame I'm looking for. I have all hens - should I worry about any fighting?