Hi Teresa!
The easiest way is to send them a message with your questions 🙂
Introduce yourself, say you are happy to host them if they answer a few short questions:
Where they are from, how many will there be, what do they plan to do...
Do remind them of your house rules (eg. no smoking, no parties, no use of the kitchen if sharing space...).
And since they are new to airbnb, guide them a bit how it works - that they stay at someone else's home and not a hotel, so they should respect it, and that 3rd party bookings are prohibited.
I hope this helps and let us know how it went 🙂 I hope they are lovely and kind guests!