if you came from any gcc country u can use ur normal license for that country for time being and if u will get resident permit here u need to change ur that license to qatari license ... and if u came from europe side and will stay here less then 3 months without getting resident permit u can use ur international license , more then 3 months stay or if u get resident permit in qatar in both cases u have to get qatari license ...

hope above is clear for u