Hi Maddy
I am also going in April (8-15th) from Richardsons in Stalham.
Heading from Wroxham area, Salhouse is nice (chargeable though). Ranworth is by far is my favourite, but it looks like they are going to introduce charges there (grrrrr). My profile pic is Ranworth Church - which is a must on a nice day you can climb the tower (about 130 steps and 2x ladders so wear decent footwear for this!) but the view from the top is lovely.
Horning is nice if you can get along by the Swan, but this gets super busy as its a popular area. South Walsham is also a nice area to moor up overnight (quieter as there isn't much there)
Potter Heigham is a bit like Wroxham/Horning where it can get very busy but if you are lucky you can moor just before the bridge. I doubt even the boat we are hiring (7ft) will be able to pass under it as I believe they are working on repairing the bridge until April at the earliest. I would imagine with all the weather we have had lately the bridge will be unpassable which is a shame as Horsey Mere is a lovely place. You can also walk to the beaches where they have loads of seals.
If you are not too fussed about Potter I would also recommend Womack Staithe as that's a lovely area with a nice shop...again reasonably quiet but quite busy as its a peaceful area.
If you can get under Ludham then How Hill is a nice stop (and free mooring!....for how long I wonder :P)
I'm tempted this year to venture down to Acle/Stokesby but not much further as the tides get pretty strong the closer to Yarmouth you get.
For things to bring, I agree with Gracie, bring glasses/pans etc as the ones onboard, while useful, are sometimes quite small. I remember the glasses were tiny...trying to have a nice glass of vino in the evening in a tiny little glass ...hmmm :)
Also warm blankets etc. The last time we went (April 2015) the days were sunny but the evenings..oh my...they were very cold. We bring blankets, winter tog duvets (again the boat yard provides bedding but these are just basics). Maybe some shopping to see you through the 1st night/morning. I believe .Com deliveries may be able to deliver to you if you say where the mooring is (maybe someone can confirm this?)
Also don't panic about mooring...a lot of the time if someone sees you are having a few troubles there are always lovely boaters happy to help you moor up. Take your time and dont get flustered if the wind pushes you about...eventually you will get moored up. Sadly there are space jumpers who will see you trying to pull into a space then nip in themselves as they have a smaller boat. Not worth the energy or hassle trying to argue...just try and find another spot.