don't worry too much. I have the experience of breast feeding.
If you keep on feeding your baby with breast milk, he will be full and you will have it generated automatically only when you are sleep well.
If you find your milk doesn't grow very well and feel your baby doesn't got enough, you can try to feed him with milk power during the night time. You will also have a good sleep during the night time.
You also eat more fresh food, or soup (papaya with fish) which is good for growing breast milk for you.