I have been playing Delta Style Bottleneck Blues Guitar in Open Tunings since 1984. Although I am far from an expert in the field, I have learned some very practical methods to understanding music.
I would like to help CBG builders who have no or limited knowledge of music, but are interested in building learn how to play their creations.
So, I have a plan.
Begin by building one string (diddley-bow) CBGs. Initially, this instrument does not need frets, but I would suggest learning how to measure and draw a correct scale onto the fingerboard. Due to the fact there are no frets at this point, I would suggest playing it with a slide. In later 1 string CBG builds, learn how to install frets correctly and then play the CBG with your fingers. (Note: For this 3 Step approach, learn to play the CBG holding it like a standard guitar, not on your lap)
A very fine example:
His creation has a Diatonic scale or aka Dulcimer scale.
For this approach, I would encourage you to use the scale found on a standard guitar. This is aka the Chromatic
scale. This scale will give you more options as we progress.
Use the third string (g) .026 gauge found in a medium pack of strings. You will need a scale length of about 23".
Ask for help and research so you learn how to build functional instruments that play in tune and have a nice tone.
Learn everything you can about that one string. Scales: Major, minor, pentatonic blues, indian, etc.
Explore everything you can do to create different rhythm with your picking hand.
Figure out the melody lines of songs.
There are an amazing amount of 1 string players.
Ask me. I will throw ideas at you too.
Hey, don't be in such a rush. Can you demonstrate your proficiency with 1 string first?