Can you drive, do you hold a driving license, do you drive on a regular basis ?
If your answer is yes, well you are already more prepared to do CP than a lot of new operators out there.
An advanced driving course is best taken early on, it's pretty hard to break bad habits that have been practised for say 10 or 20 years in some cases.
22 seems just fine to me, aand get regular updates or advancement on skills.
Nip out now and buy RoadCraft, make sure it has the CD with it.
Go on you tube and find the RoSPA/IAM Roadcraft videos, and get some good practise in now.
Even contact your local IAM or RoSPA group, the trainings free and from people with enthusiasm and knowledge.
It's a great foundation block to build skills from.
Also some Police forces run 'Skid Pan days' unsure if it still happens with budgetry constraints.