Starting and Keeping a Worm Bin

I am in NJ and I have a very shady section of yard where I decided to plant hostas, because I had no idea what else to put there! They really took off and last year I decided to transplant some. Now, I don't know if this has something to do with the hostas but I started digging and there were worms galore! I have never seen anything like it!

you can literally scoop up a containerful in one shovel! I ended up putting my herbs in this area and the soil just looks like complete worm castings! I am interested to see what happens this year when my hostas come up again. This is kind of a little experiment I have going on!