It's like any other service business @Stacey351
Do some market research to identify what sort of hosts you want to offer your services to.
Identify what services you want to offer and your pricing model
Identify why hosts should use your services (rather than your competitors) what can you offer that is better/different.
Develop a marketing plan and identify a budget to market your services to those you have identified as your target customers.
If you don't have experience as an Airbnb host then you could rent out a room in your home to get some experience.