Do it yourself course - Suggested steps:
Drawing of diagrammatic strokes.
1. Choose any pen, paper (A4 size) and ink (any colour).
2. Make strokes to create simple forms.
3. Repeat these strokes to create interesting compositions.
4. Try out atleast 4 to 5 options and pick out your best.
5. Suggested time duration for this exercise is 1 Hour.
6. These are examples of this exercise done by students at IDC.
You can also check video demonstrations for the above exercise.