You will be assigned a career coach at the beginning of your recruitment stage. They will help you decide on the ADF career path you will take. You may contact them at any point if you are unsure about any part of your recruitment process. 

Click on a date and time that will suit you on the Home page. Then fill out the necessary information to book your session.

This is necessary for your future, you will have to decide your ADF career path. You will not be able to do this without your career coach.

To have a future in the ADF, yes, you have to do it.