There should be some more follow up quests from the tutorial guy - he is where you start a couple different quests.
As far as the dying to everything. The Reborn world is level scaled, meaning that mobs in general are harder. The few mobs which are not level scaled include the wildlife (deer, foxes, bears, tigers, etc.) and a few groups whose icons are surrounded by white brackets. Therefore, the deer are actually harder to kill at lower levels than the surrounding stick men mobs. 
(Some info about level scaling from when it was first implemented in old Orbus: Patch 6.95: Dynamic Scaling, Dungeon Queuing, and more! Reborn doesn’t have 1:1 scaling though. I’m not a good person to explain it in detail, but basically it allows you to kill lower level mobs slightly quicker without being able to one-shot mobs while at the same time, it is still more difficult to kill higher leveled mobs as a solo player but not impossible)
There is no single MSQ anymore. If you didn’t finish it in old Orbus, you cannot do so anymore. Instead, there are mission givers (6 or 7 in Highsteppe) who give missions worth xp and ‘rep’. Increasing rep with a mission giver unlocks that mission givers lore quests, which don’t give xp, but do give rep.