The first thing you need to do before anything else is to get yourself a domain name. This is the name you want to give to your website. For example, the domain name of the website you're reading is "thesitewizard.com". To get a domain name, you have to pay an annual fee to a registrar for the right to use that name. Getting a name does not get you a website or anything like that. It's just a name. It's sort of like registering a business name in the brick-and-mortar world; having that business name does not mean that you also have the shop premises to go with it.
Choose a Web Host and Sign Up for an Account
A web host is basically a company that has many computers connected to the Internet. When you place your web pages on their computers, everyone in the world will be able to connect to it and view them. You will need to sign up for an account with a web host so that your website has a home. If getting a domain name is analogous to getting a business name in the brick-and-mortar world, getting a web hosting account is comparable to renting office or shop premises for your business.