Airbnb hosts will look for co-hosts that have extensive experience of STR hosting and who understand how the various STR platforms work .
The best way to get started is by becoming a host yourself ie renting out a room in your home/cleaning other people's STR properties. Once you have experience you can do some market research to identify hosts who are your target market and invest in researching and developing a marketing plan to advertise your services to hosts who are your target market .