I just got my order from 'The Ordinary' skincare folk. I bought their 'buffet' serum, some hyalauronic acid, and some rose hip seed oil. Which order do I apply? I know the oil goes last but not clear on the buffet/hyaluronic?? Should I use both twice daily or is once enough? Also do I avoid the eye area entirely with all this stuff? Am late 30s with the start of fine lines. Thanks!!