Here's how I do it. I use mashed potato flakes. Oatmeal is fine too. Lightly wet it in you plastic container so it is mushy but not totally soaked. Sprinkle some bakers yeast on top and plop your starter culture on top of it. The worms will multiply and start to climb up the side of the container. Just wipe your finger on the side of the container and dunk it in the water. The fish now have food which lives about 48 hours under water. It should have a yeasty smell to the culture. When it starts to smell funky, you just scoop out a soup ladle of the culture start it all over with your material and yeast and plop the ladle full of worms on top of the yeast and the culture is restarted. I always keep 2 cultures going a week apart so there's always plenty of worms available. Make sure the lid is vented on your containers. Poke small holes or a couple big ones. If you use bigger holes place some filter floss in the hole to keep flies out. The last thing you want is maggots in you culture. Disgusting!!