1. a few classes can track, otherwise maybe something was added later like in EQ2 to find npc's.
2. check the
wiki, mostly accurate and rather helpful.
3. its called Everquest but don't let that fool you! Compared to quest hub mmo's, WoW and afterwords, Everquest really doesn't have much. Using the above wiki you can find which npc's have quests and then hail them, you'll see dialog in brackets that will let you go inception levels deep to find what out what they want.
There is no quest tracker though so you'll have to remember what quests you're trying to complete, use notepad or the tried and true pen/paper to keep notes.