You'll need to use the BlueBomb exploit. Make sure to get a USB drive or stick first.
You can inject custom VC .wads using this tool:https://sites.google.com/site/gamemockersbeta/game-hacking/wii-hacking/vc-injector
You can find official .wads here:https://archive.org/details/WiiWareCollectionByGhostwarehttps://mariocube.xyz/
Good luck. Wii Mini hacking is pretty much so there might not be much info online yet.