One downside of most of these services is that, should you someday want to move to another web host, you'll likely be out of luck because of the custom code they use to display your site. Only a few of the services here let you take your site to another web hosting service: The most complete example of this is Weebly, which lets you download the standard site server folders. Squarespace offers some transferability by letting you output your site in standard WordPress format. As you might expect, the same transferability holds for WordPress.com.
When you settle on some domain name options, you will have to check which ones are available using a domain availability checker. Once you settle on the name you want, you will have to buy the rights to the domain you want. It is the very first step on how to create a website from scratch. Usually, your chosen hosting provider will allow you to buy the domain as part of the hosting set up process. How To Make a WordPress Website - For Beginners