In addition, by showing how I made courses for the Dvorak keyboards, you will learn how efficient and comfortable the Dvorak keyboards are. Which may encourage you to learn to type with Dvorak keyboards. Type using index fingers, middle fingers, ring fingers, little fingers, and then the combinations. Practice on home keys is the most important part of this learning process. Gradually, you will practice a wider combinations of letters, and then progress to meaningful words.
Words contain characters on all three rows.
The selection of words can be less constraint. In my opinion, it is optional to practise numbers and symbols on the top row, since your main need is to type fast words and sentences. The first one may be better at preventing the learner from looking at the keyboard, and then remembering key locations easier. The second may be better at creating finger movements and striking. To design a course, it might be wiser to combine both styles.