Sand down the rough wood surface and large amounts of peeling paint first using 36- to 60-grit sandpaper. Move the sander in the direction of the wood grain, according to the House Painting Info website, to prevent excess damage to the wood. Apply a light pressure to remove just the paint and not remove too much of the wood's surface.
Smooth out the wood after removing the initial coat of paint using 80- to 100-grit sandpaper.
Sweep or vacuum the dust off the porch thoroughly. All the dust needs to be removed before attempting to repaint or stain.
Stain or paint the porch using the new desired color according to the manufacturer's instructions.