I've never done anything other than add leaves/leaf mold, some aged manure if available, worms and kitchen scraps. I don't add any oils, meat scraps, or animal products. I don't pour liquids in the mix. The worms absolutely thive in our arrangement. Make sure the container has some drain holes, but not done in such a way that the worms crawl through. Keep the container in the shade during hot weather.
Eclectic gardening style, drawing from 45 years of interest and experience. Mostly plant in raised beds and containers primarily using intensive gardening techniques.