If you want to create hundreds or thousands of unique coupons, then you probably don't want to do that by hand. You'll want a tool that will let you create a coupon template and use that template to create the unique coupons. That's exactly what WooCommerce Smart Coupons does.
You'll need the WooCommerce Smart Coupons plugin, available at WooThemes.com, installed and activated on your site.
Smart Coupons is primarily meant for bulk coupon generation, so we'll be going straight to that page. Let's take a look at the following steps:
If you go to WooCommerce | Coupons, you'll be able to see all of your automatically generated coupons.
If you want to manually look at or edit the coupons before creating them, you can tweak the last two settings on the bulk coupon page. They'll allow you to export the generated coupons in a CSV file. You can then reimport them using Smart Coupons through the Import Coupons tab on the Smart Coupons page.