First, avoid touching your face. Touching your face can increase oiliness, irritate your skin, and encourage the growth of bacteria. Develop a hands-off policy.
Second, keep oily hair off your skin. And look for oil-free hair products. Oily hair care products can get on your face and clog pores.
Third, be gentle with your skin. Use your fingertips (not a washcloth or sponge) to wash your face with a non-abrasive cleanser. Use mild skin care products.