Quests itself is a very big plugin to setup, which...is not what i will teach you here.

To setup Quests itself, follow this link: https://github.com/PikaMug/Quests/wiki

To setup the quests checks for a rank however, you came to the right place.

Currently there are 2 stats tracked:

• Quest points
• Quests completed

Setup:

    quests:
      - qpoints:10
      - qcompleted:100

This means a player must complete 100 quests, have a minimum of 10 quest points.