oops, didnt realize that, wasnt thinking for sure, apoligies, forget it
No, it's okay, I understand the excitement.
But here's something that might help you:
Will allow you to emulate ATARI, NES, SNES, GB/GBC/GBA, SEGA GENESIS, TURBOGRAFX, Arcade Games (CPS1, CPS2, CPS3, MAME, NEOGEO), and more emulators.
On the Virtual Console side, well, it's literally nothing that RetroArch can emulate (and more).
You should complete the N64 emulation with it, and use Not64 and Wii64 together.
WiiWare is something interesting, depends on your taste really.
GameCube games weights 1.5GB at max (you can trim them but I haven't found a way to make trimmed ISOS to work)
Wii Games are heavier, roughly 3+GB the most common, with popular ones being 430MB in size.
About where to find them?
Well... it's against the rules to ask for copyrighted material, and also to give direct information.
But aside of Rom sites, there are Internet Archives where you can find whatever you need
About RetroArch, I made this small guide to encourage people to use it: https://gbatemp.net/threads/retroarch-wii-setting-it-up-mini-tutorial.590900/