If you are doing this in the oven,
In a roasting type pan, Place the roast in the pan, fat side up.
Place 1/2 cup of water in the bottom of pan.
On the roast you can place any herbs or spices you like and rub into fat. A few things I like on a pork roast are.
Salt & Pepper
Sage,
Garlic and or Onion Powder,
Place in a 350F Dg. oven for 30 min. per pound or 170 degrees on a meat thermometer. Remove from oven and allow to set for 10-15 min's before carving.
You can also make a nice au jus out of the juices on the bottom of the pan and removing fat.