Congrats on the car, pics are a must if you haven't already.
As to your problems, it could be a few things, and VCDS is a must to help you diagnose.
If you don't have the manuals then get saving from
here
If you have VCDS do output tests to see if the secondary air pump is running.
If it is then i'd start looking at the combi valves which are vacuum operated to allow the secondary flow into exhaust.