Connecting a domain means telling the internet which site should open when someone types your address.
The safest path is to prepare the catalog first, review the main pages and only then connect the public address.
Keep the old site live until the new one is ready
If the business already has a website, prepare the new public catalog first. Only change the address when the new version is ready to receive visitors.
Next step
See how this structure looks in a real demo.
Compare segment demos and choose the path closest to your business before creating the catalog.