A domain name is the bit of the URL (the site address in your browser’s search bar) that identifies a web page — in this case your website. For example, ours is websitebuilderexpert.com. You can register them separately at sites like GoDaddy and Domain.com, but website builders offer to do it for you when you sign up with them. Most provide it for free (at least initially), while a handful charge a few extra bucks.
GoDaddy Website Builder is an online editing and publishing tool that helps you create a website, regardless of your technical skill level. Just create an account, pick a design and use the built-in editor to add your own images and text. You can make your website as simple or complex as you’d like. Need to sell your stuff online? No problem. You can add a full online store complete with product listings, coupons, shopping cart, shipping and multiple payment options.
You can absolutely do that. If you want to upgrade to a paid plan to get some of the features you want, then you can switch at any time through the My Products option in your account or with the help of a GoDaddy Guide. Once you upgrade your site will have all the same customizations and work that you've already put in place, just with the added features.
After you choose a website builder and a theme, take some time to learn how to use and customize these tools. Once you feel comfortable, start making changes. Some easy changes to start with are to add your name, logo, and contact details. Then, change the text font and color, add image galleries, background pictures, banners, and other site enhancements.