Weddings are hard work, and it's a tough go to get to a point where you make a regular living at it. I came from a news background, and I know guys who have come from fashion and other fields of photography. I think you have to have a strong grasp of what you're doing, and then learn the wedding biz. My advice would be to take a good, week long, wedding workshop. Some hands on experience is really critical.
The other thing is that no matter what your genre of wedding photography is, from PJ to super formal, you have to have a firm grasp of basic wedding skills. You need to be able to manage family groups, and do basic formal portraits. When photographers get into trouble, it's usually because someone gets left out of a family group shot. Once you have the basics down, start putting your personal style into it.
I don't think you need to have specialized gear for doing weddings, although it nice. Two cameras, zooms from 17 to 200mm, and a couple of flash units will pretty much do you. I have a couple of high speed zooms, but I almost never use them.
David Buzzard