Have you tried using KLS's tool for creating tasks via the task system? It does help quite a bit. It's in the SVN if you are interested in using it.
As for global variables, look in the wiki. They are explained fairly well. Keep in mind that any NPC that you use for global variables has to have that enabled on them in the database. You might not need that for this particular quest, but you might later. Also you can look in a number of other quests for examples of using globals. Just grep(or search if Windoze) out qglobal from your quests directory. That'll bring up some quests with that used.
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