Im making a football game which kicks a football against a wall on a gluPerspective view

How would I do a code so that if I press:
- left key - the ball will aim left but doesn't shoot
- right key - the ball will aim right but doesn't shoot
- up key - the ball will aim upwards but doesn't shoot
- down key - the ball will aim down but doesn't shoot

z key - shoots the ball against the wall