@Zach22 I think @Monika64 has given you good advice, but I want to give you another perspective because I am pretty sure your mistake has been one 90% of all hosts have made.
First of all, you might want to snooze your listing until you are comfortable with your all settings. In case you are not sure how to do that, go to Calendar and More, see the left side list and the box with "Listed" in it. Select and change to Snooze. This will give you breathing room to get set up and educated the way you want.
Secondly, I suggest you look at the profile of the guest who booked. Despite the rate error, would you like to host this traveler? If so, message the guest, explain the issue, but do not raise the rate. Instead, start to establish a rapport and let the guest know that by the time they show up you will be experienced. I bet you get the best review ever! Just a thought.