Hello @Dalia36
Have you stayed in an Airbnb as a guest?
This is the 1st thing I recomend to new hosts.
Payments are credited 24 hours after the guest checks in - but for 1st time host, it can take up to 30 days - this is to avoid fraud.
Please make sure your friend is aware of any "particulars" of your house - how to control heating, how to lock the door, where the guests should leave the key.
I usualy get a little basket in the kitchen with salt, pepper, tea, coffee, leave milk in the fridge, and all the basics, a couple of cereal bars, plus a couple of bottles of water in the bedroom.
I also leave make up remove wipes, so there are no stains in the towels.
But really is up to you what you offer to the guest.