The First Stage is the Initial Use Stage. This stage is comparable to you and your partner having "The Talk" about wanting to finally start trying for a family. This is when you are tossing around the ideas of what names you will pick out, where the baby will sleep, how you will discipline your children, where you will send them to school, etc., but again, these are just your ideas.
Just like with dancing...the Initial Use Stage, which is usually around a Student's first 5-10 Personal Lessons, your Instructors are introducing you to the idea of dancing.
This is where you, and your Arthur Murray Professionals, are finding out which dances you like, where you can see yourselves using your dancing, and even if you enjoy taking dance lessons.