Gather 3 wooden planks
Gather 4 cobblestones
Gather 1 iron ingot
Gather 1 redstone dust
Open a crafting table
Place 3 wooden planks across the top row
Place 1 iron ingot in the center
Place 3 cobblestones in the middle row on the left, center, and right
Place 1 redstone dust in the bottom center
Take the piston from the result slot