You will notified by the embassy or the Visa Application Centre where you handed in the application when you are allowed to travel to Norway. You will also be notified about the date you have to enter Norway at the latest.
The UDI will ask the embassy which is responsible for your case to issue you this visa; you do not need to apply for one.
The Visa Application Centre where you handed in the application or the embassy will contact you to agree on a time for you to come and collect your visa. It will take up to a week for them to contact you. You will collect your visa at the same place as you handed in the application.
The visa is usually valid for 30 days, and show when you can travel to Norway.