Hi Suzi,
A yellow colour is the most common instant fix for dark circles under the eyes. There are a lot of products that are sold specifically for this purpose and they are generally available in your local store.
Puffiness makes matters worse, and you will again find that there are a number of good products to help here too often called "eye reviving gel" or similar.
With crows feet use moisturiser designed for the eye area, and use just a light dab of "your skin tone" concealer in the area (I find the new lightweight "Matt-mousse" foundations great for this)....If you do use too much (or the concealer is too heavy) it often looks OK when you apply it, but 20 minutes later it all creases up and the area looks worse than ever.
Chrissty