I put about a dozen soda cans in a row on a berm for my nieces first time shooting. Ages 13 and 11. Cans were barely standing up so they moved when hit. The girls had a blast starting with a pellet rifle, 22 Ruger, 9mm Beretta pistol and carbine, 45acp, 45lc, and a .410. Think I made some converts. Good luck.
Ron