I highly recommend Dslyecxi's video "Flying & Landing the Huey in DCS".
It's very (old) informative and well-spoken, as Dslyecxi tends to be, and should help a lot.
He goes into the theory of helicopter aerodynamics and operation, but only as deep as is required.
He does mention that this video is to help people who fly helos in non-sim games like ARMA, but it applies just as well to people who are new to the genre altogether, as I was when I first watched it. (Jesus, was that really 4 years ago?)
anyway, linky thing: