In order to make Bread you first need Wheat which you get by planting Seeds (you can find the seeds in tall grass). Find a piece of grass near water and use a Hoe to reveal the soil then plant your seeds and wait for them to grow. You'll know it's Wheat when it begins to change colour into a murky green/yellow colour. Take out the Wheat and go to your crafting table and select Bread. You'll need 3 pieces of Wheat to make Bread.

You can speed this up by using bone meal.

If you need any help feel free to PM me.