How can I check the treatment cycle and cost before a wrinkle Botox consultation?

I am concerned about the expression lines on my forehead and between my eyebrows, so I am considering getting a consultation for wrinkle Botox. Since I have never had the procedure done before, I am organizing what questions I should ask before the consultation. I am also curious if wrinkles that appear only when smiling or frowning are judged differently from those that are visible even when I am at rest.

In particular, I would like to know what criteria are typically used to determine the treatment cycle for wrinkle Botox. I am curious whether follow-up treatments are administered every fixed number of months, or if consultations are based on when facial muscles start moving again. I would also like to check in advance how the cost differs depending on whether the treatment covers only one area or includes both the forehead and glabella.

Since this is my first time, I would appreciate it if you could let me know the starting area to ensure my facial expressions don't look awkward, and when I should check the progress. Would it be helpful to share my usual facial expression habits and work schedule during the wrinkle Botox consultation? I plan to take my time making a decision after the consultation.