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You do the quests to gain more SP for your skills, which for the most part won't really matter until later on. However, you'll need to do all the quests to access later quests, including one which allows you to ride Mir, so you can't just pick and choose which quests you want to do.
I think that changed.
Here is a quest guide: http://www.basilmarket.com/forum/1463806/0/Evan_Quest_Guide.html
I havent done all the quest, but I have already have the lv 50 mount quest (started it).
Oxi, what is you Evan IGN?
And I say ignore the quest for now and just get to lv 70 for the event. then do the quest after. You should be fine without those points.