For the absolute newcomer to the internet, the difference between a domain name, a web page and a website might not be clear, so let's explain it.
Your "Domain Name" is your chosen online name. The best option for your first domain name is something that includes your store name.
If your store name is "Nancy's Jewel Shop" then you should try to get the domain name
Your domain name should be chosen to match exactly how your customers refer to you. If at all possible, stay away from strange permutations like the one just explained.
When you hire a web programmer or designer, they will create an entire website according to your request. The "Website" is everything you have online, including your Home Page, Contact Us page, Product Catalog, Photos of Custom Designs, etc. Whatever is uploaded and visible online is part of your "website."
A "Web Page" is an individual page, including the photos and graphics on that single page. Your "Home Web Page" might include a welcome statement, or a mission statement, or a brief comment about your jewelry store. It might also include a few photos of your store, and even your store logo. This page might include 5 photos and information, yet it is still just a single page.