You can get microworm starter cultures off ebay it was about $3 with shipping. When you buy it it will have some step by steps with it.
What you will need:
media- I use oatmeal
many plastic containers-butter container size
starter culture- ebay
pop holes in the lid of your plastic container.
Put around 1/2 inch of media in the bottom of the container ( make sure it goes to the walls of container. you dont want it to be in the middle)
open your stater culture and place the starter media on top of your media( do not mix)
Put just a pinch of dry yeast on top
now leave for around 3 days
The worms population will grow and they will start wigging up the sides when you see 100s on the sides of the container just rub your finger along the inside and then dip your finger in with the fry.
have more then one culture going
Start new ones every month (when they start to smell bad start another)
If your still confused youtube has 100s of videos on this.