What most naturally follows?

How to file a motion to compel
Confer with the other side.
In federal court, rule 37 requires that you make a " good faith " effort to get the information from the other side before asking for the court's help. Many states also require that you try to get the information from the other side informally.
Accordingly, you should reach out before filing your motion. Ideally, you should send a letter.