Looking good means more than simply dressing well. Proper skin care will not only leave you looking good, but feeling better too. Having a few extra products in your bathroom (or realizing the importance of moisturizer) doesn't make you Patrick Bateman. It makes you a guy who cares about his appearance and health. Of course, you've got to know which products to use, and for that, you need to know your skin type. An easy way to get a diagnosis? First thing in the morning, take a facial tissue or a piece of paper, and press it against your face.
You likely know if you've got oily skin, but you should see spots on the tissue, corresponding with commonly greasy areas—cheeks, chin, nose and forehead. You'll want to wash your face with a soap, which can absorb the excess oil and use products like a mattifying moisturizer that will combat shine throughout the day. An astringent will tighten pores and clear away the dead skin that can trap oil.
Combination skin falls somewhere between the two above and is a common type for most men. The tissue will likely pick up traces of oil from the forehead and nose, but will be otherwise clean, except for perhaps a few flakes from dry spots. Use a toner (which is less harsh and drying than an astringent) to keep oil at bay and balance skin, then follow up with an oil-free moisturizer.