@Audrey846 The easiest thing to become a "host" of is bacteria. Our bodies already contain around 10,000 species of them, but if you'd like to host some additional ones, just go out and lick something!
If it's an Airbnb host that you want to be, your basic steps would be to set up a room or property for guests and publish a listing. You don't have to undergo a metamorphosis; you just have to do the job.
@Audrey846 Everyone here was new when they first started. The first thing to do is start out by reading before asking questions. This link will give you a jumpstart