I was brainstorming a few plot ideas, when something hit me like a ton of brick walls. But that part was the only thing that I admit to having a clear idea of what is supposed to happen. If anyone wants, could you give some advice on how to follow up on it?

Spoiler: Basic plot thread
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The story opens on two angels (both named after Gabriel and Micheal, respectively) getting a distressed feeling from a battle-saint in the land of Fergeti. When they arrive, they find the dying saint, an apparent dead traveler, and a few other corpses belonging to an unknown party. Gabriella tries to gain some information from the saint, who reveals that she was supposed to escort Graf, the dead traveler, to see the ruler of Vereti. Unfortunately, a previously unknown enemy known only as "The Bringer of Death" ambushed them, killed Graf, and left the Saint to die after something spooked him.

As she lay dying, she admits that she wanted to keep Nephy safe, but isn't able to elaborate before she expires. While Gabriella is contemplating on what happened, a patrol of solders lead by the distinguished General Anatoly Zenon of Prospero Keep encounters the duo. After a brief and tense standoff, both parties agree to meet at Prospero Keep: Zenon's men will give them information on the current politics and events of the realm while Gabriella and Michael will share their knowledge of potential ancient enemies that might be lurking around...

And that's where my train of thought turns into a blur. What I want to incorporate during this particular story after this sequence is ways to potentially Segway into using Zenon as a way of telling the backstory of the small Kingdom while Gabriella and Michael both give explanations of divine beings and stratagies, hoping that the information they both have will pinpoint a potential suspect. This is supposed to also lead into character development, and I want to know how I can do it right (For the record: Zenon is a pragmatic commander who is currently enemies with his former mentor and leader of the rebels, Gabriella is a diplomatic angel who wants everyone to be happy but has no personal experience with human emotions, and Michael is the legendary badass who kicked the Dark Lord's ass a long time ago and has been on an ego trip ever since).