There are thousands of templates to choose from in WordPress’ own Theme Directory. Search for the types of themes you’d be interested in. If you’re setting up a newspaper search ‘newspaper’, if you need a site for your café search ‘cafe’. There’ll be dozens, if not hundreds, of contenders. Clicking on a theme takes you to its own page where you can see user reviews and preview the theme in action.
If you’re using Wix’s free plan, then you won’t be able to use a regular domain name like “www.mysite.com” or “www.mysite.net” (domains like this come with Wix’s paid plans). Instead, your site will follow the format www.yourname.wixsite/yoursite, which is enough to get it up and running. But if you’re going for a more professional look, then we recommend upgrading to a paid plan to secure a more polished domain!
In an integrated application/setup development environment, the original developer should modify the WiX source files in sync with the application development. As soon as a new module has been started, a new registry entry, service or other dependency has been coded, the appropriate setup modification should be made in parallel. Using this approach, no important information will ever be lost and, as a bonus, the setup program will be practically finished together with the application itself.
As far as actually doing the nuts and bolts building and design of your site, you also have plenty of options. You can hire someone to design and code a website, or you can try your own hand (if you're a novice, The Best Courses for Learning How to Build Websites is an excellent starting point). You can use an online service to create web pages, or build it offline using a desktop software tool. Or, if you're a coding dynamo, use a plain text editor to create a site from scratch. How you mix and match these decisions depends on your skills, time, budget, and gumption.
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.