Sun Light setup

Is there any tutorial in setting up a Sun light for an environment scene?

Could you state more clearly what is the problem? Is it about matching up
sun light with a photo background, or…?

Just in case this might answer something. Lots of good answers are found
in the manual…(yes, it’s a link - the forum redesign pulls my leg all the
time, heh…)

But the problem is the the sun lamp has a every hard shadow. I’m trying to create the sun light from a 3D enviroment. Just asking if there is any other ways or tips in creating a better sun light?