Heat the engine up. There is a drain plug in the oil pan under the car. Pull the plug (you may want to change the plug to a magnetic one that helps catch metal shavings) let it drain until nothing comes out. Pull the oil filter while it's draining. Replace the plug and the oil filter. Dip your finger in the oil and run a "bead" around the rubber gasket on the business end of the gasket. I'm not sure what the torque is on the oil pan nut. Only hand tighten the filter.
Check the model center to see how many quarts of oil your car takes. Add the requisite amount of oil and check the dipstick to make sure that it is to the full mark.
As to coolant (NEVER OPEN THE CAP ON A HOT RADIATOR), open the radiator cap and release the pressure. There should be a small bolt or drain cock on the bottom of the radiator. Place something under it to catch the 15 - 20 quarts of coolant and either remove the drain plug or open the drain cock. After it drains empty I usually close the radiator, take the heater hose that runs to the intake manifold off, run a hose into the top of the radiator and run water into it until I get clear water coming out of the heater hose. If you don't do that, the closed thermostat will prevent flow through the engine.
Drain the engine once again, replace the radiator drain and heater hose and add a 50/50 mix of water and green coolant. The coolant not only impacts the freezing and boling point, it has additives that prevent the corrision of your cooling system. While your at it, make sure your overflow tank is connected and working properly and add the coolant to that as well.
Run the car to operating temperature, let it cool and check your coolant level. If the overflow system is working properly, any air in the system should burp out and be replaced by coolant in the overflow tank.
Good luck.
