hey all....jz wanna ask...how do u spin the ball?

when i bowl, although my hand's straight the ball goes into the longkang...damn memalukan cn teach hw to bowl like all the pro bowlers? the spinning one which goes outside n curves baq inside jz like ryan giggs' freekick...pls

so cn anyone tell me how to do a hook? lol....jz tell me where to spin and all...i try to figure it out...eheh