How Can I write a Click To Move Script?

Does anyone know a click to move style script? Basicly what I want is when I click on the ground somewhere, a little red "X" (or some sort of notification) pops up for a second that way I know where i clicked, and my player starts walking to that spot. And the camera is looking down on the character (already have that setup) so the only camera movement is with the arrow keys or w,a,s,d, and it only rotates the view along the x,z axis, but doesnt move the character.

I've tried the raycast to open doors but I can't figure this one out