Your employer will give you the visa number and you can track down and print from this site www.moi.gov.qa

when you got the visa number just open that site:

-click "visa inquiry",
-enter "visa number",
-tick "visit visa" (if you are business visa) and
-click "submit".

It will show your visa and all your details, print a copy (must be coloured copy) to be present at Immigration NAIA during departure.