The majority of hosts understandably want to work with cohosts who are hosts themselves so they understand how the various STR platforms work, how to manage difficult guests, how to optimise listings etc.
So I would say start by hosting a room in your home.
if not it's like any other business set up your own marketing channels and invest in advertising to reach hosts you've identified as your target market @Sasha281
what did your market research show you was the best way to engage with hosts ?