Hi, Guest. Let me ask you this - do you play mtn dulcimer already? Do you have a favorite tuning? Because there is no fixed way to set up a dulcimer. Me, I like D-A-A because making chords is so easy.   

I'm baffled by the lack of frets. 'Nuff said.

The lowest string should be the farthest away from you. Take a look at the slots cut into the I-forget-whether-it's-the-nut-or-the-bridge. Are they wide or narrow? If the wide slots are close to you, you have a strange instrument indeed.

If not, I suggest you put three strings on it. Low D farthest way, then two A's, each a fifth above. The low D is the same pitch as the D strong on guitar. Then get a book or surf the net and learn how to make the chords. (Where I live, we reject extra strings. They don't seem to add much volume, and they make it harder to keep the dulcie in tune.)

After you've got that down, drop the A closest to you to G and start learning songs in minor keys.