Even if you are good in Driving, it is highly prudent to follow a driving course. Since, you have driven in India, you can get the half course. The half course fee will be vary from QR 1200 - 1600 depending upon the institute. + once you will pass, you will have to pay around QR 250 to get the license card.
I got my license like this about 3 months back from, United Driving school, it cost me total QR 1470.