You will need to print it out and place it on the fold of you card and cut around so that it's equal both sides of the card. You may have to resize the template to suit your own needs.
It's a very rough template but hopefully it might help someone!
Now it's up to you to embellish it as you so wish!! I'd love to see your rocker cards, you can post a link to them under this post!! I'll be posting mine up when it's finished to show you how I got on!!