Step 1: Wood Selection and Shape
A couple years ago my dad and I took apart an old, solid wood cabinet. I stacked the wood and stored it to the side waiting for another day(pic #1). The cabinet was made of three quarter inch pine. Normally I would not recomend a soft wood for a skateboard, a hardwood like maple or oak would be stronger and more durable. Although this board came from an old growth tree and contained 67 growth rings in just five inches meaning it is much denser and stronger then todays pine. So find yourself an old board or some thick plywood and get started.
I went for an old 70's cruiser style shape. The shape is simple and models after the original skateboard. Create your own design or trace another board, your call. Draw your design onto the wood and test the shape by standing on it.