Norway is a fantastic destination.
I've ridden the South from Oslo to Bergen. It was surprisingly gentle country until I got around to the west coast.
Wild camping is free but hard to find in the heavily farmed south. Unfarmed land is steep, rocky or wooded and hard to camp on. I often managed to find small areas of flat land hidden away. Locals are always helpful in advising good places to camp. Commercial campsites are pretty good and not too expensive.
Food and drink are expensive, so develop a taste for smoked mackerel.
Thursday is food-tasting day at many of the better supermarkets so make sure you take advantage to widen your diet.