Before writing new topic, please check frequently asked questions.

Every NPC (Non-playing Character) that has a yellow exclamation mark over his head has a quest for you. If the NPC has a blue exclamation mark, it indicates a daily quest that can be done every day. A yellow question mark means that you should speak with this character to continue your quest.
There is a notice board in every town. You may use it to see omitted and upcoming quests.