We have a wall in one of our bedrooms that we want to take out but it is a load bearing wall. It was the front wall of a closet, which was about 12’ long by 4’ wide. The bedroom is upstairs so there is nothing above it, but there are ceiling joists that tie into the roof. I know it is load bearing because the joists in the attic that run perpendicular to the wall do not run the entire length of the room - one goes from the front of the room toward the back and ends right over this wall and the other joists are shorter and go from the back of the room to just over this wall (so those are only about 6’ in length. We want to remove the closet wall (we built a new closet space into the attic that is bigger) but I don’t know what size beam and studs I need to put in it’s place to carry the weight of that span. Any help would be appreciated.

No worries - I didn’t know if there was a general rule of thumb out there that said if you have a span X feet long, you need a beam at least Y inches thick or anything like that.