Unless it is an inferior piece of meat, don't make potroast out of it.
Preheat your oven to 350, rub the roast with pepper and salt. poke some holes in it with a knife and insert slivers of garlic. Cook about 45 minutes/pound. Use a meat thermometer to get the degree of doneness you desire.
If you make potroast, brown the roast in a pan, cook covered with a little water, throw your veggies in for the last half hour. You can use broth if you like, but if you do, don't add any salt to the meat. Cook until the meat is falling apart.