So I recently bought an old wii, specifically for the purpose of homebrewing. I'm able to understand so far as to what needs downloaded on the Wii and how to backup, but I can't find any sites with games. I noticed Vimms Lair wasn't an option anymore, and other sites I look through use ROMs for emulators. (Unless, those do work on the console). I think you need .wbfs files, and I'd really appreciate if I was pointed in the right direction
.wbfs is short for Wii Backup File System iirc. I used to convert my ripped or downloaded .iso files to .wbfs files for them to be read from an external HDD. Don't know much more about it anymore though.
Edit for OP: Vimm's Lair is still listing Wii games for download. You can even choose .wbfs file format. If you also search for 'wbfs manager' it should guide you in the right direction. For Wii U there was some program on Windows which let you organize your HDD of backup games and download said games from the official servers. Don't know if any of the Wii (or Wii U) servers are still online but might be worth a shot.