Printed Material

Not sure this is the right place to ask, but I figured teachers would have an opinion on this.

I am selling dulcimers with a good portion of my market being beginners to the dulcimer, and often beginners to playing any instrument.

I am trying to work out what I should send along with every dulcimer including some printed material, a pick, and a tuning key for the models with zither pins.

I am willing to reinvent the wheel if need be but if there is material in the public domain that I can use or base my own material on that would be a plus.

I thinking of some very basic getting started info on playing and tuning, a bit of dulcimer history, a list of links, a fret board map, and some chord charts.

Any suggestions?