This page is a bit spoilerish ...
The following quests can be found in/about Coldhaven:


 
  Rumors of Coldhaven
- Start this quest by speaking with any innkeeper in Skyrim
- This quest has you investigating Vampire rumors and following a mysterious stranger
- This quest will lead you to Coldhaven and will have it added to your map
    
 
 A Founding Father
- Start this quest by speaking with Sovrena Tamara
- Offering to help find Dalaran will lead to you becoming trusted/accepted in Coldhaven
  NOTE:  Do the quest stages in order ... (you must report to Tamara before reading Dalaran's journal)
- This quest can award you a player home (if you never used my LAL start)

    
 
 Sewers of Coldhaven
- Start this quest (won't be in journal) by finding Gwyndris' note and speaking to her about her fears
- This quest leads to you investigating activity in the sewers

    
 
 Katseels' Fears
- Start this quest (won't be in journal) by finding Katseels' note and speaking to her about her experience
- This quest is also tied to the sewers

    
 

 Coldhaven's Most Wanted
- Start this quest (won't be in journal) by finding a note in Werrek's room
- Approach him and ask about the note to start the search for Gudaric somewhere in Coldhaven

    
 

 House Aydril Initiation
- Start this quest after finishing "A Founding Father" by speaking with Telorsar Aydril
- Completing the quest lets you join House Aydril and gain their specific Vampire bonuses
  (Grants +40 Magicka, +10 to Enchanting, Destruction, Illusion, Alteration)

    
 

House Tarbonnis Initiation
- Start this quest after finishing "A Founding Father" by speaking with Imradi Tarbonnis
- Completing the quest lets you join House Tarbonnis and gain their specific Vampire bonuses
  (Grants +20 Health, +10 to Light Armor, Sneak, Lockpicking, Speech)

    
 

 House Quarra Initiation
- Start this quest after finishing "A Founding Father" by speaking with Yurilas Quarra
- Completing the quest lets you join House Quarra and gain their specific Vampire bonuses
  (Grants +20 Stamina, +10 to Heavy Armor, One-handed, Two-handed, Block)