Check out the new knowledgebase article here on CigarBoxGuitar.com, in which Ben “C. B. Gitty” Baker explains exactly how to achieve the popular “Open G” GDG tuning on your cigar box guitar.
This tuning is the de facto standard for playing the blues on cigar box guitars, and in this article Gitty walks you through the 4 different ways that you can tune to GDG, and covers the string gauges that you’ll need for each.
Plus there’s a bunch of other good info in there about strings and tunings, to help you start figuring some of it out for yourself!