Go hide under a KEYBOARD coz u r a geek noob!
Serious, thats a hard question without knowing what youve done so far,
how you maps are handled, ... the list goes on.
All the same, in a general way, to do what you want, you need to...
1> Check if mouse was clicked, if so store the target location of the click.
2> Calculate the angle between the 'current" position and the target position.
3> Rotate the player-object to face the target.
4> Move the player-object "forward" by a fixed amount(of your choice).
5> Check if youve arrived at the target, if NOT, go back to step 1.