I can't give you advice on training the cat, because my parents did that when I was too young to observe, or away at uni, but as to the crumpled paper...

my parents' most recent cat *loves* crumpled paper. My mom has a lot of drafting paper, and if she leaves large pieces on the floor, the cat will come and play in it. (wrapping paper and tissue paper are also a hit)

the cats have also enjoyed: large pompoms (Not small ones because they will eat them), shoelaces, sticks with a ribbon on the end, ribbon with a pompom on the end (both of these require active participation of the human, who must entice the cat, but can get them to do flips in the air)

... now I miss the cats