@Fat Boy Kyle Still though, perhaps you could provide like little tidbits for our characters, little motivation for a potential plot arc.
I will be. That's kinda what I mean by "pushing arcs". As well as providing events that characters might wish to get involved in (e.g. the Siege of Leyawiin), I'll also be posting tippets of information in the form of rumours/decrees/news/missions that your characters can then choose to pick-up from NPCs. For example I might post: "Rumour: Citizens of Makarth have been reporting sightings of a Daedra cult in the hills to the South-West of the city. Apparently the Jarl is willing to pay anyone for information they might have." Then, if that's relevant to a main story arc, I might PM you some classified info. The main story surrounding the nightmares and marks and stuff will be something that will eventually require players to come together so I'll give much more guidance then.
Also like I said to someone else in a PM: "All these events, from the siege of Leyawiin to the likely attack on Anvil, can and will be decided by player actions. If on the off-chance no one gets involved in the conflict, then I will decide events based on what I think will impact characters the most. So even being neutral will cause an impact."
Cause from what I'm seeing, everyone's spread everywhere. And I'm particularly limited cause my knowledge of the Elder Scrolls geography sadly is limited to Skyrim.
Most people won't know anything outside of Cyrodiil and Skyrim. And considering that the last game in Cyrodiil was set over two centuries beforehand and it has been ravaged by war since then, supposedly no-one has any real knowledge. Just look at some maps and wikis online and fill the gaps with your imagination!