Getting your brand messaging right (such as explaining what your business does and the essence of your brand) can be a lot harder than it seems. You may wish to hire a copywriter to ensure the main copy of your site really hits the mark with users, especially on the Home Page and the About Us page. As mentioned in Stage #1, you will also need to decide whether the remaining content (such as blog articles or a description of your products/services) will be written by you or by a professional writer.
A domain name is the bit of the URL (the long address in your browser’s search bar) that identifies a web page — in this case your website. You can register them separately at sites like GoDaddy and Namecheap, 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. website building software