As it happens, there are instruction materials available on youtube.
Tim Twiss has a number of starting-from-scratch stroke style videos.
What a beautiful looking instrument! Do you have a keyboard of any sort" There are a lot of tunings but a good place start is "A" I usually tune tune the long strings first.
If you've got a real piano find the 2nd A below middle C (Middle C is just left of the lock for the keyboard cover) That'll be your bass (fattest) string
The next string will be an E (four white keys up) Next string is G# (the black key that follows two white ones)
The next is a B (two white keys up)
The short sting is tuned to the E above middle C (three white keys up)
For G tuning move every thing down a step D (SHORT STRING) G D F# A
Your strings are gong to stretch for a while, so you you'll get lots of practice retuning for a couple of days - don't despair.
Your ear will eventually get used to what it's supposed to sound like.
Hope this gets you started.