to get started take the box you have(not the pizza box) and cut off anything hanging off the side. KEEP THOSE PIECES they will come in handy later for support. So now bend the cardboard as much as possible so there are creases everywhere! This will make sure the ramp doesn't make a right angle. Then you need to bend it into shape and keep it there as you tape the entire thing on the side you will ride on. This will make it smooth and easy to ride on.