first run your truck for about 10 mins to get the oil warm and able to flow better.
raise your truck and get a drip pan, to catch the oil...
remove the plug in your oil pan as shown here...
then let it all drain out, preferably into a strainer to check for excessive metal fragments for signs of wear
then plug it up, move to the oil filter and remove it with the drain pan again. when installing the new one, take some old oil and lube up the gasket, never is it a good idea to install a dry gasket on a oil filter.
install your filter to a turn past hand tight.
fill your engine with synthentic oil as required to the manufacturer's capacities, 6/7 quarts depending on year and size of motor.
check for leaks over the next two days....and thats about it...