I originally made a 2D vtuber, first I drew the whole model in Clip Studio Paint and saved it in a PSD file which I rigged on Live2D Cubism, it was a lot of work despite how simple my model is as it doesn't have textures, expressions, items, animation and more.
First I downloaded the trial version
Then followed both beginner and experienced tutorials by DreamTrove
Finally, I've used my model on Vtube Studio
I did a simple avatar without shadows or highligts, even less effects or reactions. It's not a perfect rigging either
I don't use my model, my computer can't handle having OBS Studio, Clip Studio Paint and Vtube Studio open at the same time, it just began to freeze everything and crash.
As well I don't stream much, but currently I use VeadoTube Mini and use a png avatar.