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This is connected to your ISP (Internet Service Provider), and you will probably need to upgrade your Internet plan to be permitted to host a website. Multiple connections are best; otherwise your website will be down whenever there's an interruption in your Internet connection. This is possible but difficult with Windows; it's easiest and often least expensive with Linux, though the Mac OS can also be used. This software will let you set up your web pages and link your domain name to your website.
Get a static IP address. Secure a fast 24/7 Internet connection. Find a stable system for your computer. Purchase web server software.