If you prefer a more traditional URL, you'll need to purchase one from the likes of GoDaddy or Namecheap. Domain name pricing can range from extremely cheap to extremely expensive, depending on whether or not domain squatters are looking to flip a valuable piece of online real estate. You'll want to get something short but evocative and catchy, and depending on what you do, you may find that many of your first choices are taken by either other legit domains, or by squatters who've scooped up the names as an investment. For more, please read How to Register a Domain Name.
You may expect a 404 page to pop up from time to time on new websites, but with patience and determination, you can build a fully functional, beautiful, and highly converting site from scratch. The main takeaway here is always to test your website before launch and remember that refreshing and revamping your website is a task you will have to perform regularly from now on if you want your business to grow.
How To Make a WordPress Website - For Beginners