Very simple, take your UAE driver's license and its copy, your RP and its copy, 2 photographs, go to Muroor (Traffic Office), preferably in Madina Khalifa, you have to fill a form, get your eye test over there itself, pay the fee (you need to have ATM card) and that's it. You have to show them the proof of your blood group also (Ias far as I remember. Your UAE license will be converted to Qatari immidiately. Good luck.