@Jessica2735 You can try putting out feelers on the nearest local social media group for homesharers - https://community.withairbnb.com/t5/Get-Local/ct-p/en_clubs
But what most hosts want as a co-host is either someone they already know and trust, or failing that, an experienced host with a proven record from their own listing. So the most realistic way to get started would be to inquire within your own social group or, if you happen to have a rentable space, start your own listing. You can also send your CV to local property-management firms, if you have relevant experience.