We picked up a used bator this weekend for $60!! Now, we cant wait to get some eggs to hatch!! So, question is this... if I want eggs to hatch mid Jan, I collect in Mid Dec. I have never hatched using an incubator before so any special advice?? I am going to set it up in my bedroom... temp is fairly constant in there. I am going to Walmart and get a temp/humidity thermometor. how many should I hatch?? We now have New Hampshire Reds along with our RIR!! Also, if we have chicks that are 3 weeks old, can we mix in day olds??