In the summer of 2014, I took a workshop from Julian Waters on Black Letter Variations. He is originally from England but now resides in the States. He studied under Hermann Zapf, an internationally well-known German calligrapher. Julian teaches all over the world, so I felt honored to be able to learn under him. The practice sheet you see above was my first sheet used in the workshop. We were just endeavoring to get the basic Black Letter letterforms straight up and down.
We were given a detailed workbook that I know I will continue to use for help and inspiration.