@ocelot60- It is crucial that you follow up with your doctor or dermatologist frequently to make sure that you don't develop more skin neoplasms. Once you have been diagnosed with them, you are at a greater risk for developing more.
Though there isn't much that you can do about the damage your skin has already suffered from years of sun exposure, you can prevent further damage. Always be sure to wear sunscreen, hats, long sleeves, and pants when you are in the sun. You should also avoid peek afternoon hours outdoors, since the sun is strongest during this time.
Though these recommendations might not sound very appealing, skin cancer is serious so it is important to take precautions against it.