For most expats in South Africa, the first order of business is buying a car, as public transport is unreliable or nonexistent. I've written about the topics on Joburg Expat and thought I'd share a few articles with you.
Tips on Buying a car in South Africa = joburgexpat.com/2011/04/tips-on-buying-car-in-south-africa.html
How to register a car in South Africa= joburgexpat.com/2014/02/how-to-register-car-in-south-africa.html
The question many expats are confused about is whether they need a South AFrican driver's license. You don't. Here is more info on that:
Should I get a South African driver's license? = joburgexpat.com/2010/08/should-i-get-south-african-drivers.html
And finally, you have to renew the license disc for your car every year, here is what you need to know about that:
Six Things to know about renewing your license disc = joburgexpat.com/2012/02/six-things-to-know-about-renewing-your.html
I hope this helps, good luck!