How do I wire a tanning bed with Voltage of 220 amprerage 12, and Circuit breaker (AMPS) 20 Outlet shows a 6-20R which is what I have. Can I use 12/2 wire? The wire has a black, white and copper wire where do these wires go on the outlet?

Yes, you should use 12-2 wiring. Ground goes to ground buss, black and white go to a double 20 amp breaker. However, I really think you should hire an electrician.