Hello David,
It is all down to which area of the Southern Broads you wish to visit first.
You could go straight across Breydon and head for St Olaves and on towards Somerleyton, Beccles and Oulton Broads. If you are going to moor at Beccles or Oulton Broad yacht stations you had better book a mooring.
Alternatively you could branch off once over Breydon (right hand down a bit) past the Berney Arms and onto Reedham, you could go down the river Chet (into Loddon about an hours journey) or continue towards Brundall, there are a number of entrances into Rockland Broad the inlet to the staithe is almost hidden, but there are good moorings with the New Inn just across the road from the staithe.
There are 24 hour moorings just through Brundall, a path takes you up to the village. The Ferry House Inn at Surlingham is well worth a visit, again I would book a mooring.
Onto Bramerton Common (the 24 hour moorings) or just past to the Waters Edge (very good meals here but not pub grub)you can also book a mooring.
You can get all the way into Norwich and there are moorings at the yacht station.
Regards
Alan