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Aesthetically, it's as easy as using a vtubing app of your choice. Culturally, you have to make a few choices. How much are you gonna capitalize on the anonymity? What kind of content are you gonna focus on? Are you comfortable with people worshiping or being super critical of you? The more people who "oshi" you, I'd say you are more of a "legit" Vtuber. This basically means people think of you/your character a lot while you are not actively interacting with them.