B. Look for a quest guide on google.
No, do not!
The quest guides on google are terribly outdated and they can be misleading you in some case instead of helping out.
The settings department in the last years has worked a lot on the quest chains to clean them up and add hints and dialogs to point your character to the next quest in the chain.
Therefore my suggestion is to:
1. pay attention when you end a quest because the NPC should hint you who to go speak next
2. if you forgot or it's still not clear look at your quest notes, they can be a valuable source of information
3. if you still have some difficulty understanding where to go next this probably means the quest dialogs are not clear enough or needs improvement. In that case please open a petition telling you problem in the clearest possible way. Venalan or Mordaan (settings department leaders) will provide feedback and if a bug is spotted they will fix it at the first opportunity.
Of course joining a guild and getting help from other players is important as well but pointing out where bug are give us the chance to fix them and improve the game
