Okay so I have 3 little chickies all 3 weeks old right now. I went to the store the other day to pick up some pine shavings and I figured while I was there I may as well price out some feed. I'm totally confused now. ...for example..Chick starter 18% layer? what the heck does this all mean? The hatchery guy I bought my chickies from gave me a bag of starter, but it was just from his own stash so I don't even know what I should be feeding them when this food runs out. Someone help?