Every young wizzard should be able to cast at least basic spells. Magic, as everything else, is learnt by trial and error. You practice certain movement, and once you master it, you should be able to cast a spell off your wand. It is all in wrist flexibility... Click and move your mouse, and draw the symbol floating above each ghosts head to defeat them. Be fast, or these ghost will haunt you for the rest of your life. Have fun.