Just bought what to do next

Hello, The best, safest, and cheapest thing you can do for your BPY engine is to send your ECU for reprogramming. There are a couple of companies out there that are huge in VW/Audi/Porsche performance, and the reputation depends on which engine they tune. APR has been reliable for years. If you are going to modify anything, start by making sure there are no leaks in the charge air system. This means turbo, pcv valves (there are two), intercooler, intercooler piping, turbo piping, throttle body gasket, charge air pipe, noise tube to the cabin, etc... Stopping the boost leaks that are ever-present there will result in a return to stock performance, and a good base for modification. Don't overpower your brakes.