Great to have you in the community! Perhaps it might be worth connecting with other hosts in through our Host clubs if there are any in your area for their recommendations. You can find a local Host Club here 👉Local Host Clubs
On the issue of more guests than registered showing up, here's an article that I was able to find which said:
"When a guest asks to squeeze in a few more friends, you have a few options. If you can accommodate the larger group, send your guest atrip changethat includes the additional cost per night for the extra guests.
If you’re unable to accommodate the larger number of guests, let your guest know that your place isn’t the right fit for their group and ask them to cancel their reservation. They’ll be refunded according to your cancellation policy.