There's no consolidated thread here on fashion photography. A number of us have dabbled in it here. Most of what you see labeled "fashion" on this site is not really fashion photography, which tends to involve some specialized elements that a lot of people on this forum don't understand or don't involve in their work. That said, you should begin by just asking questions and see what you get. I'd also encourage you to open an account at modelmayhem if you haven't already. There are a lot of seasoned fashion photographers in the forums there.