The best thing to do for shipped chicks is dosing Nutri-Drench. That is a nutritional supplement specifically for the purpose. It is probably too late to get it online but Tractor Supply carries it. In lieu of that, you can get Poly*Vi-Sol without iron at most pharmacies.
If they are chilled, the best thing is a blow dryer to warm them up.
If they are chilled, the best thing is a blow dryer to warm them up.