Search:

http://wotlk.openwow.com/

http://wowwiki.wikia.com/

That's best you can get for now.

You might be missing quest chains that are started by items or objects. Everyquest Questgivers only shows quests started by NPCs. Check full list of quests in that zone by opening quest log and...

If it's already showing only quests that you haven't completed then you probably haven't unlocked that quest yet. It doesn't check if you have completed requirements for that quest.

You have to use addons settings to get your completed quest data from server first.

To see quests on map you also need Everyquest Questgivers addon.