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You need a bluetooth adapter(20-30 bucks at bestbuy), a Wiimote(I've heard the newest ones don't work but don't know if it's true, 40 bucks), and if you want a SNES controller then another 20 for a Classic Controller. You can do a ton of other stuff with it.
I'd start there. They have a good tutorial and compatibility guide for bluetooth adapters. If you need more help I'd be glad to help, my AIM is in my profile thingy..click my username. It's really easy to use and stuff and I love playing classics/doing random things with wiimotes!