Step 2: Cut It Out!
Add any text and images you want printed on the card to the template.
Print the template onto cardstock.
Start cutting out all the pieces. For the piece that forms the back of the card you'll need to leave a thin flap to connect it to the front piece. Which side you leave the flap on will depend on which way you want your finished card to open.
Seriously consider the benefits of getting robots with lasers to do the cutting for you.