I was trying to do Pulldowns today with my new chin-bar and I wasnt exactly sure how to do it. I mean I havent seen any videos. What i am doing is 3x8 5seconds desend. But I notice that my Right bicep gets more sore then my left bicep when i do this exercise and that my forearms hurt like biatch. Are these okay spots to be sore in? And Whats the Distance that your hands need to be when you do a pulldown/pullup?

My pulldowns (palms facing away) run the gamut from thumbs touching to as wide as I can get on the bar.

While the close grip puts a good stretch on the lats and is friendly on the fore-arms, I find the widegrip (and I mean wide) is:-

Harder on the fore-arms.
While not stretching the lats it tends to give the upper lats a bit more focussed attention along with pecs and inner back.
Because they're widegrip they're harder to do than a closegrip.
In the widegrip version the range of motion is less but there seems to be more intensity on the muscles.

I can do way more close-grip than I can wide.

The negative wide-grip (where you hang in the air descending slowly) is just what you said it is.....a flaming Bee-atch.

But I love to suffer so do them on a regular basis....:)