Post-operative care is a funny thing, as each surgeon has his/her preference as to post-operative care. So it is always recommended to ask your doctor how he/she wishes you to care for your wound.
Here is some basic information:
Scab is bad. You do not want a scab to form as it slows healing
Cleanse the wound. Some surgeons want you to clean with soap and water, others recommend sterile saline, others hydrogen peroxide (either full strength or half/half with water). Most recommend cleaning wounds once or twice daily.
Keep the wound moist. Moist wounds heal faster and often better than dry wounds. Therefore a petrolatum-(Vaseline)-based ointment works best. Such include Bacitracin, Polysporin, Neosporin, or Bactroban (available by Prescription), which are all antibiotic ointments. Some physicians recommend Vaseline or Aquaphor Healing Ointment.
To cover or not to cover, that is the question. If you keep the wound moist with a petrolatum-based ointment, it may not be necessary to cover the wound--as long as the ointment stays on the wound. On areas that are prone to coming in contact with clothing or bedding, it is often preferable to cover the wounds to avoid making a mess.