assuming that you're bobber fishing, that also took me a while, until i realized what was actually going on when my line was cast. basically, wait for the stick at the end of your line to become vertical, and then wait for it to sink into the water. you'll notice that itll sink a little bit then pop back up. whats pulling it down is a fish, so when its down, you tilt your wiimote back and hold it there. you'll start to pull in the fish, and then you're all set.