for a wormery you don't want earth worms , you want brandlings (we used to call them when fishing ), they are compost worms or manure worms or sh**, you get the picture.... Anyway, they are much redder than earth worms and have slightly yellowish bands around their bodies. Just turn over any pile of horse manure and you will see them in there.
Give them some manure , and cover the container , for warmth and to keep rain out , and add small amounts of veg and fresh manure as and when needed . The more worms you have in there the more you can add.
They will lay eggs in the medium if all goes well , and will multiply quite fast. They will tend to migrate to the top layer of food , leaving the lower layers ready to be removed for use in your garden etc. Don't put huge deep layers of veg or worm food in the bin , or whatever you make the wormery out of , as it will start to compost and cook the worms !! Just add very little and often , and cover with a damp layer of news paper if you want to .
cheers
Russ