Can you be more specific with the question? If you haven't seen it, there's quite a bit of information on the following page: https://www.khanacademy.org/computing/computer-programming/html-css/html-css-further-learning/a/what-to-learn-next
You should definitely follow the links to more information, such as the "from these slides" links under "Hosting webpages on a server"-- you'll find a lot of the details there, such as choosing a domain name and registrar, and selecting a hosting provider.
If your questions aren't answered by the content on that page and the links, can you ask a specific question about what part of the process you need help with? (like, "I can't FTP my files to the web server" or "I still don't understand what a registrar is and how to pick one").
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