The bottom line is - would you make more then this in your home country? This is about 15,000+ Qatari Riyals per month. Yes, you should be able to live ok on that salary. Housing is always your biggest expense in Doha.
Do a little research on what airfare costs are to places you want to travel. Try to do some research on cost of living in Qatar vs South Africa. The price of automobiles (my husband bought a 2007 Honda (small SUV) for about $27,000 QR. The insurance on this is around $800 per year. This was a brand new vehicle. If you check the classifieds on here there is always someone selling a used vehicle..

I hope this helps you out some.

Best of luck

Lisa