I have a 6 month old roo, and now a broody hen. I am not sure how much "work" he has actually done but its my first roo so I think I need a crash course in candling. Seems like from what I have read 10 days is a good time to try. What will I need. Flashlight, Dark room, Egg anything else helpfull? If some of the eggs are fertile but layed later than the first that hatch will mommy hen stick around to hatch them or bail when chicks appear? Thanks!