Choose a level, hard surface where the stage will be built. Keep in mind the preferred orientation of the audience.
Draw to scale a plan for the stage. Estimate the amount of wood and nails necessary to complete the task.
Select a sturdy hardwood from the lumber yard to use for construction. Select large planks, at least 2-by-4 inches, to cut down to create the stage surface. Choose four hardwood blocks to create the foundations for the corner of the stage.
Dig holes for each of the corner supports of the stage. Insert the blocks of wood for the foundation and fill in the remaining space around the blocks with the dirt extracted from the holes.
Cut the planks of hardwood to size, and connect the four corner blocks using the planks and nails. Fill in the middle of the stage with the remaining planks, adding a hardwood brace in the middle of the stage to maintain structural integrity.
Sand the completed stage and treat the wood with sealant to prevent rotting and degradation.