I use this one. What you will learn about this instrument is that there is no standard for it. Some play it tuned GDAE, which essentially turns it into an Octave Mando. I much prefer GDAD, but many play ADAD. Pat Broaders of Bohola plays CGCG I believe. My recommendation is to get the book I linked to, learn to play the basic chords in GDAD tuning so you can begin to play the rhythm backup. The move on to Zan Macleod's DVD. By the time you are done with these, and using the book above for a chord reference, you will be well on your way. Another thing to do is listen to as many bands using this instrument as possible. The rhythm style is distinct, and fundamental to Irish/Scottish accompaniment.

Good luck and welcome to the Land of the Lost,

Mick