I will be starting a coop soon and getting my first chickens. Coop will be 4x8x4 about two feet off the ground. Really enjoy reading the posts but have a few questions for you experts that are already adept at raising chickens. Here goes...I know what feed, scratch and oyster shells are for, but do you mix it together or keep it separated? ...chicken wire or netting? ...do you leave the door open all night or let them come and go?...what would you consider the max number of chickens for that size coop?...want to get it right so that is why i am asking! Thanks in advance for any and all help!