Not all oily skin is created equal. Some people find the skin they're in can be both rough, flaky and tight as well as shiny, greasy and prone to blemishes. This is face washing.
Combination skin is skin that's both oily (usually in the T-zone of the face) and dry (usually on the cheeks), and because different parts of the face have different skin care needs, combination skin can be tricky to care for. Choose mild, oil-free products to take care of business on both dry and oily alike.
Use a light, liquid moisturizing lotion (creams will be too thick and heavy) with sunscreen for your daily face moisturizing needs. Add products with AHAs to combat acne and fine lines -- a little will go a long way, and AHAs may make your skin more sensitive to sunlight, so don't forget to wear sunscreen.