Hey @Eric_Atkinson
The Webflow subdomain is your staging environment where you can test and try new things before publishing to your main domain.
If you want a custom domain you need to buy it > add hosting to the site > publish to your custom domain. I will suggest using godaddy for your custom domain because Webflow has really nice automatic domain connection.
All features work on the subdomain and custom domain.
Hope this makes sense. Feel free to reach out if you have more questions.
Piter 