Start simply by folding your piece of paper in half, hotdog style.
Fold the left and right top corners inwards, until their edges align with the center fold line.
Similarly to Step 2, fold the left and right top corners inwards again, until their edges align with the center fold line.
Next, fold the whole sheet in half, along the center crease line.
Finally, fold each wing downward so that the longer top edge of each wing aligns with the bottom fold edge of the plane.
Classic means simple and awesome. Your plane is already good to fly!