My 2000 ford windstar needs new Brake Pads. I have been told this is easy and I can do it myself. Where do I find good instructions?

A Chilton’s or Haynes manual would be you best bet (gives visuals). You can pick one up at you’r local parts store or if you are feeling cheap you could barrow one from the library. These manuals include all sorts of information and tips for everyone from beginners to advanced mechanics

Do you have to have your rotors turned every time you change your brake pads?