Hi Shortypops,
Verification will need be done by the Qatar CAA. You would need to complete the forms required by the state which issued your original licence to be verified as well as the ones for the local CAA and pay any fees applicable to the foreign state. There is no local fee at the QCAA at the moment.
After your licence is verified the QCAA may then give you a validation of your foreign licence allowing you to operate a local aircraft. The validation will only be valid for a fixed period of time, during which you could complete the Air Law exam, medical and flight skills test.
Hope that answers your question.
Chinchilla.