@Alyssa143
Welcome to ABB hosting!
Yes, when you click "publish listing" it goes live.
What you could do is take one final look at all of the categories to be certain that everything is in order. Pay special attention to your listing price and any applicable discounts.
Once you publish your listing immediately CHECK YOUR PRICING AND DICOUNTS.
Then preview your listing. Next, go through each heading and category and subcategory and add/ change/ edit as required. You can always change details, pricing, photos, etc. at will.
You can also check out other listings to get a sense of what yo may want to include in your house policies and rules.
This forum has plenty of information and tips for hosts.
Wishing you the best of success!