Pumping doesn't determine how much milk you produce, baby will always get more out so don't be discouraged if you don't pump a lot. It can even take 2-3 pump session to make enough for a feeding.
Your nipples will definitely take a beating at first but it gets better. Keep nipple cream handy! Throw a schedule out the window and put baby on breast as much as they want, they go through multiple growth spurts and it keeps your milk supply up.