>>7283496A lot. You need enough upfront for 5 people's wages for a few months plus artists+riggers. Possibly pay for their equipment as well. That's only the bare minimum. Of course the vtuber market is really saturated right now so you have to have exceptional people and launch and debut perfectly then you MIGHT get a few thousand subs.
If you do it all right you still won't make your initial investment back for a long time, but that's okay as long as you can afford that upfront and can get your group to sustain itself so it isn't operating at a loss.