Both my boys are strongly right handed and strongly left eyed. Once I figured that out, I taught them to shoot lefthanded. Best, easiest, cheapest practice for them was Nerf guns! As Dutch stated, just get to where mounting the fire arm feels correct first.
I like his suggest of a .22 auto for the reasons he stated. Might want to consider getting a LH one, to keep brass out of your field of view. Very few options that I know of, but Savage does make a few. Another cheap option to for lots of easy practice would be a BB/pellet gun. Could be done at or inside the home!
