Get your tickets to watch a game at Carrow Road. If there's nothing happening while you're there, you might like to check if they offer a tour of the grounds.
You'll have no end of sightseeing choices when visiting Norwich. Carrow Road is a good place to begin here, but there are loads of other fine attractions to discover. University of East Anglia, Norwich Cathedral, and Norwich Castle are near the sporting facility and will fill in your day nicely.