Bottom bracket is possibly shot.
http://www.parktool.com/blog/repair-help/trouble-shooting-a-creaky-or-noisy-drive-train
http://www.parktool.com/blog/repair-help/categories/bottom-brackets
A real Bicycle Sop will have all the special tools and skill necessary to repair it.
Just bought it. I've put 50 miles on it. Its always done this.
Read the creaky drivetrain post.
Having the Same problem, where did you buy it?
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What exactly are you needing instructions for? A bikes is a frame with a bunch of aftermarket stuff hung on it.
Everything on a bike is found on just about any other brand of bike and the individual components are usually documented at the manufacturers
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