Now, about performing with the dulcimer, there are many, many dulcimer players who have YouTube channels. Depending on the type of music that you are interested in, you might do a search to find dulcimer performances. Once you start going to dulcimer festivals you will meet various people who play the kind of music you like and can search them out on YouTube or Facebook. Since the mountain dulcimer is traditionally an old-time instrument many festivals are centered on that type of playing, especially in jams, but there are many ways to play this instrument.
One performer who I especially like, not just as a performer of his own original music, but also as a teacher is Bing Futch. He has a series of videos (currently over 300) called "Dulcimerica" in which he teaches and shares his own performances, as well as other things he does as he travels all over the USA teaching and performing for others. Search YouTube for him.
If your preferences are for soft, soothing music, check out Linda Brockinton (http://www.lindabrockinton.com/) or search YouTube for her. You might also enjoy Tull Glazier (http://tullglazener.com/). He is also on YouTube. His website offers free tab each month, as well as lessons.
As you can see, I am passionate about the mountain dulcimer. As you begin your journey on this beautiful instrument feel free to tag me in posts with your questions and updates on your experiences along the way. I would love to help in any way I can.
Enjoy the journey!