My girls are scheduled to arrive by wednesday. Do I need to find a grit for them right away or when will they start needing it? What kind of grit should I look for? And what about a dusting box while they're in the brooder?(which is in our screened in porch in sc) is that a necessity? And how often does the brooder litter need changing? I've read to put paper towels down over the pine for the first week or so, is this necessary? What kinds of things are recommended to prevent boredom in the brooder?