E3D, The guys who have posted before me have given you good advice though some is possibly far more advanced than you need for now.

There really is no written rule that I know of to follow and at the time the picture you supplied in your first post was printed the usual arrangement was to go with what was simple. Typically most half A models as you showed us have the up line at the rear and the down in the front.
I also believe the model shown in that picture was designed to have the elevator horn on the underside of the elevator. Since the stab and elevator are mounted higher than the wing, this would mean a simple straight pushrod with no bends in the middle and would make the rear lead out line the 'up' line.
Look closely at the pictures I have modified and you will see that the picture has been changed to show the elevator horn and its enlarged detail more clearly to the reader.

One could argue that the plane just needs the slight bend shown to link the push rod but I really believe it would be best to have the elevator horn protrude downward for simplicity.

Robert