this is not the definitive answer, but what i could find:
Complete as a proficiency check, the type/class and instrument rating revalidation requirements (QCAR-FCL 1.245)
demonstrate to the authority knowledge of relevant part of QCAR OPS1 and QCAR FCL 1 AND knowledge of flight planning/performance AND knowledge of Human Performance Limitations
( 1.005 and 1.015)
English language proficiency required (not a prob I should think)
You must have:
100 hours PIC of aeroplane
Valid Multi IR
then ( HERES A TOUGHER BIT)
Pass an exam for ATPL knowledge in the state of licence issue. Otherwise if you must have a straight CPL(A)IR with no ATPL knowledge you are restricted to single pilot ops until you pass ATPL course THEN you will be restricted to Single pilot ops until you have 500 hours on multis.
QCAA doc and the references above are on:
www.caa.gov.qa/laws/index.htm click on QCAA regulations then FCL1. the table to look at is on page 1-A-15 and 16
Hope this helps
as for medicals
you must hold a medical certificate in accordance with QCAR-MED..whatever that means
As I've said, its what I could find by looking into the book