I have to agree with the things Rick and Strat said, because if you can't get good results without all the physical elements, then you sure are making it even harder on yourself to use the physical elements. I think starting with HDRI's is a better practice to improve your scene lighting, once you've mastered the control of that, then I would make the jump to the physical world.
And as also mentioned you should have LWF in your toolbox before you add the physical sky,sun, and cam.
But, with all that being said if you still think you "need" to be using them.....check this out, it should help you a bit.
http://www.vrayelite.com/camsky.php