100 is plenty to start with! If you can't keep them outside or in a garage, I suggest using a small Rubbermaid bin that will be easier to keep in your house. You can use dirt but not sand. The soil has to be able to hold moisture without compacting. You can also use cheap bags of organic soil from Walmart or Home depot. It doesn't have to be anything fancy. When I was a little boy, I kept a worm farm in my backyard for fish bait. I used the dirt from outside and threw in table scraps every now and then. It's very easy, no matter which way you choose to go about it.The Flizzle;4890703;4890703 said:I wish I could keep them in the garage, but it gets cold here in the winter. Do you suggest going to Walmart to get a hundred or so? Also, will plain dirt be good or should I go for a nice topsoil?