All you really need to know is the horizontal and vertical sync ranges. If you can find out your monitors model number (it should be printed on the back of your monitor if you don't have your manual or the box it came in) do a search on it in Google and see what you come up with. As soon as you have the ranges you can run the xf86config script (you shouldn't have to know the path for Xconfigurator btw, you should just be able to type Xconf and press the tab key to complete it followed by enter) to configure XFree86.