writing dulcimer tab

Is there a book on how to take a piece of standard notation music (piano) and write it into dulcimer tab? Is there a way to know from looking at the flats and sharps if it should be tabbed in DAD, DAA or some other tuning? As you can tell from the questions, I am a real beginner when discussing music theory. I have some tunes in fake books (melody line only) I would like to put into dulcimer tab. Any help would be appreciated.