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So Awsome.. i will try this.. how many liters do I need? How many worms do I need to start with?

This one is a cheap Ikea boxes at 45L, I think :p I've seen people online do really small ones under the sink! But it's much easier to manage with some size on it. More size = less managing. I tried a small one first, and the worms just wanted to escape. It was either too wet, too dry etc.
I bought 500 grams of worms. But you could probably start with less.. You should be able to find compost worms outside too, they seem to love horse dung.