It's easier than you think to live stream from a Mac - 9to5Mac
Enso.me Desktop Streamer
Splashtop Streamer permission settings on Mac OS – Splashtop Business - Support
myKensho Desktop Streamer
FIFINE USB PC Microphone, Gaming RGB Desktop Mic for Mac/Windows, with Real-Time Monitoring, Mute Button&Mic Gain, Pop Filter&Shock Mount, for Streamer, Gamer, Youtuber-A8 White: Amazon.co.uk: Computers & Accessories