Basically when you pull the map up it will show you where the quests monsters are located or region where the items are located? What race did you end up choosing? If it was dwarf make sure you have find treasure active when you are looking for quest items on the ground. It will show them on the mini map.
To install addons extract all the files to the adon folder.
Basically C:\Program Files\World of Warcraft\Interface\AddOns
If you can't get quest helper to work use Carbonite (I actually like it better)