@Peter770 Firstly, welcome to the hosts family!
Just do your best in the preparation of your place to welcome your first guest. As a first time Airbnb guests, they may not have experience either. You may need to communicate with them well before check in, during their stay, and check out. In addition, you may explain to them how Airbnb review system works. Any ratings not five are bad.
Since you just get started, I would suggest that you accept more short term stays like 2-3 nights. It helps to get a large number of reviews quicker.