This sounds weird, but Milk of Magnesia actually makes for a good mask-- absorbs oil and leaves skin soft. Queen Helene Mint Julep mask is another I'd recommend; cheap and effective. Many retinol creams are great for your skin, too, and you can sometimes get cheap ones at health stores.
Sun protection is, of course, very important, as are rest and hydration. Make sure to take off makeup before bed, too.