You will need to feed it milk by bottle ideally for 3months. The feeding are twice daily with powdered milk from your local coop or farm supply store. In the barn you have the calf penned up, always have high quality hay, fresh water, and calf starter feed available for it. Keep it sheltered in this wonderful weather we are having.
I have seen calves take to grain,hay, and water within just a couple of weeks, but they still need their milk. Just think of the calf and the momma cow in the field. The mooma has her head doen eatting pasture and the calf attempts to imitated the same.
If you need any help depending on where you are in Tennessee I would be happy to.