You will only be able to express a very small amount, maybe only half a teaspoon, if you express in the first few days after birth. This is normal and enough.
On average, most exclusively breastfed babies will feed every 2 to 4 hours. Some babies may feed as often as every hour at times, often called cluster feeding.
Some breastfed babies pass stool just once a week. That's fine as long as your baby's stools are soft and the baby keeps gaining weight and nursing. Formula-.
The recommended feeding schedule for a newborn is usually every 2 to 3 hours. That means you'll be a pro at feeding your little bundle of joy about 8 to 12.