We set up our worm bin last weekend. It was a lot of fun.
Then we went ahead and added some frozen food scraps as well as the worms. We threw newspaper on top of the food scraps. The newspaper acts as the dry material, allowing optimization of the required carbon to nitrogen ratio. When we use it to cover the food scraps, it helps contain moisture and provide a comfortable living environment for the worms.
We had some helpers hold the worms up so you can see them closer. These are Eisenia fetid, red worms used specifically for composting.