How does breastfeeding work?

Husband and I are expecting our first baby so I have no breastfeeding experience. How does it work? When I pump, I will store the excess in bags in the freezer/fridge, right? When it’s time for baby to drink it, I warm it and add it to a bottle? Is there a particular bottle/nipple that you recommend for a newborn? I’ve seen some bottles that have little baggies in them. What is the point of the baggie or is that the same bag the milk is stored in from the freezer/fridge? 🧐 Any other tips?