Earthworms are the easiest livestock on our farm, but they serve a very important purpose, increasing the fertility of our soil. We're still experimenting with the best way to incorporate them into our permaculture system. Start from the bottom to read our adventures in order.
We got our worms for free from a friend. Once they get going, you tend to have enough to give a start to someone --- you might ask your friends with worm boxes if anyone has a start for you. (Ours haven't gotten that numerous yet, unfortunately.)
You will need to keep it in a place above 50 degrees F, but in the summer that can be outside in the shade. (Not in the sun!)