You fail to mention which Dummy in the pregame tutorial.
The Combat dummy in the weapons combat training are only "defeated" by weapons. As a Sorcerer have patience. It may take you some time - this part is more geared to Fighters, Rangers, Monks, and Paladins.
The Magical Stone statue to be destroyed in the Arcane tutorial room requires a hit with i.e. Magic Missile. There is a scroll in a chest near you if you failed to select that spell upon character creation. Save the Melf's Acid Arrow to sell... '>