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.
Stop whatever you're doing and ask yourself this simple question: "Do I need a website?" If your response was anything other than "yes," you need to think again. It doesn't matter if you're the head of a multinational corporation who employs thousands of people or a local mom-and-pop shop from around the way, you need a website to help potential customers find you online. If you have a business, failure to establish an online home is a failure to grow.
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.