If you are interested about general introducion of golf, check this link out:
http://en.wikipedia.org/wiki/Golf
If you feel text is too boring, here is a good demo on how to do a basic golf swing.
I think the instruction video is very detail, easy to follow, straight to the point and well demonstrated:
http://www.videojug.com/film/how-to-perform-the-perfect-golf-swing