When you decide to join a Unit, you should also join the national organization.
That starts here with this link: CAF Membership.
Ages 13 to 17 can join as a CAF Cadet. Ages 18 to 23 can join as a CAF Colonel - Student, but most of us will join as a CAF Colonel.
This link here: Join-Get Involved, has another link at the bottom titled "Pay Local Indiana Wing CAF Dues". It just $35/year and supports our local unit.
Eventually, the national organization will assign you a Colonel Number! This will be used to keep track of everything later on.
Here is a link to the Unit Manual. Yes, it is a bit overwhelming at first.
All pilots must also Become a Sponsor.
However, the best thing you could do right now is to contact the Operations Officer. Let them know that you are thinking! They can help guide you through this process.