Nobody learns a rotation correctly by adding actions one at a time from Lv1. Most jobs don't even have fleshed-out rotations until 60.
The principle of Specificity of Training says the training needs to align with the desired outcome. If you try to learn a job with an incomplete action set, you're going to put the buttons in positions that don't make sense later when you have more actions that need to fit together in certain ways, and you'll develop bad habits that you'll then need to spend time unlearning at higher levels.