I have 6 hens right now, 4 of them are 3 years old, 1 is about 5, and one is just out of pullet stage. I am wanting to up my chickens to about 10 hens and a roo. Roughly how many eggs should I put in an incubator to get this. I know that no one can guarentee anything just kinda looking for ball park. I also know that about half of what you put in an incubator will be male usually so any suggestions?