i suggest you contact the broards authority for details on fishing in the area or contact the tourist information centre near were you intend to go the fishing tackle shop is still open in potter higham its called lathams i visit it regulary when i go to norfolk
I can reccomend the Definitive Guide to Fishing in Norfolk & Suffolk by John Wilson. It has quite an extensive section on all the Broads, including details on where you can hire boats by the day. It also covers hundreds of stillwaters and rivers around the area, and even has a small section on camping/caravanning locations that have onsite fishing.
I bought the latest (2002) edition last week for 9.95.