I have a loft I want to create from a face, or at least some edges of the face, along a straight guide curve, terminating at a plane that is perpendicular to the guide curve.

I have to create the plane first.  I'm trying to use the plane created by lines from two different sketches to create the plane.  SW won't let me select the two lines, it only selects one or the other.

What am I doing wrong?