So I noticed the kiosk of all abandoned quests to the right of the vanguard mentors, and upon inspection I found that every quest line in vanilla, dark below, and house of wolves was there. For good reason, for new players and all that, though I don't think they had intended them to be there for veterans. I grabbed the very first story mission, you know, the, "eyes up guardian" thinking I'd get a bit of nostalgia from it, but you can't select the mission, seeing as how your not supposed to have a gun at the beginning. You also can't abandon the quest once you have it. So... What do?
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Once you select it, go to orbit and then back to the tower. Talk to the vanguard mentor for the class you are playing and it will progress.