To use a WBFS file, your Wii must be . This is a process that involves installing the Homebrew Channel and custom IOS (cIOS) on your console. While many detailed guides exist online, it's a process that requires careful following of instructions, as there is a small risk of "bricking" (permanently damaging) your console if done incorrectly.
If you want to build your archive legally using your own physical game discs, CleanRip is an application you run directly on a homebrewed Wii console. It safely rips your disc directly to a connected USB drive or SD card. How to Set Up Your Storage Drive for a Wii Archive wii wbfs archive