I have a small coop with 4 hens and my husband just built me a new large pen 20'x25'x7' so I can increase my flock. Here are my questions: 1. Should I put the new chickens in the new pen and then introduce my old hens to them in the new environment? or the other way around? 2.What breeds would be best for all getting along? The hens I have are 3 yrs old..1-maran, 1-white leghorn, 2-amerucana 3.Would guineas work with a flock of chickens? 4. How many hens would you recommend in a pen this size? 5.My local feed store has 3 month olds in a number of varieties....how long would I need to quaranteen these? Thanks!