Fishing is a good way to earn great amount of silver. You can also help friends fishing to gain Vitality.
Fishing belongs to the harbour system which can be found by clicking the harbour icon.
Click the fishing boat to enter the fishing system
Click Start Fishing to start. You need to wait for a while before next fishing. Everyday you can do fishing for a limited number of times.
There are altogether 6 fishing ground. Higher level fishing ground and one-click fishing will be available as character level rises.