you will need...
a box of cardboard
scotch tape and paper(some people may not need this, you will see later).
Books(any kind, just for support).
Step 2: Taping
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.
Step 3: Shaping
You can generally make this into whatever shape you want, just make sure it isn't vertical and the jump isn't too sharp. You want a slightly curved drop and a curved part at the bottom to a jump! the ramp will need to be supported by the pieces you cut off earlier. Take one of them and tape it under the jump part at whatever angle you want it to be. If your parents allow it you can tape it straight to the ground with the duct tape, this will work better but IT WILL LEAVE THE GROUND STICKY. Otherwise you can take the paper you have and tape it to the ground with scotch tape and tape the ramp support to that. The picture for this step has the perfect shape so look at that for help.