Instructions
Go to the Wii Shop Channel on the Wii Menu and press "Start."
Select "Start Shopping." Add Wii Points if you do not have any yet. You will be directed to a screen where you can buy anywhere from 1,000 points for $10 to 5,000 points for $50. The original NES games sell for 500 points, or $5.
Select "Virtual Console" once you have adequate points. You can browse by "Popular Titles" or "Newest Additions" or search by category or game title.
Scroll through the listings of games and click on the ones you want to purchase. Select "Download" and the Wii will download the game onto your system.
Press the "Home" key on your Wii remote to access the Home Menu and select "Wii Menu" to return to that opening screen.
Find your downloaded games, which will be placed on open channels on the Wii Menu. Click on them to play the games.