The Campaign Builder's Guild

Thanks for the suggestions..  I forgot about The Sharn Inquisitive, and will scour through that.

I have intentions of having competing quads that will resurface, but didn't consider one from Arenal, so I'll include that.  I do like the idea of the Monastery and that would make a good mission trying to get in there.

As far as the overall story arc of the Tarresque.. That is actually from the Five Nations, on page 101.  I thought that it would make a good overall story.

Hello, I need some help formulating the story arc for my new campaign.  It is set in the Eberron Campaign world with little deviation from the campaign canon.  As it is still basically a "spy" campaign so any suggestions are appreciated.
There was a great war that lasted for the last 100 years ending in one of the destruction of the 5 great nations.  The remaining 4 put aside their differences and signed a treaty ending the war.  There is now a period or peace, now in the coldwar with the thought that war could start again at anytime.

There will be two parties of 4 PC's each. One group is based out out Breland and the other Karrnath.  They will both be working for the spy agencies from their nations.

My over all thoughts are that an evil cult (the Blood of Vol) is digging up artifacts of power (Khyber Dragon Shards) that will unleash a great beast(I'm thinking a tarresque, but never stating that, nor ever actually ever needing to use it) to be used by the cult leader (Vol, an ancient Lich queen).  I read it in the Five Nations Supplement.  It is called Operation Leviathan.

Other powers are going to be:

The Nation of Droaam.  A nation of monsters is pushing a drug {dream lilly) through the 4 great nations.  I'm going to start the Brelish group to work with a local crime lord.  A new crime group has moved into the city, that is pushing the drugs.  Working with the crime lord they'll take down a cell or two and then get info on where their source is.  They'll then try and destroy the source in Droaam..  I'm thinking that is where they'll meet some of the agents of Vol and get some clues for the grander arc.

The Nation of Draguun.  A nation of goblins that have resurfaced into a united force during the last war.  They have lived for the last 10,000 years as shadows of the former goblinoid empire that spanned the continent. They are now uniting to bring their great nation back.  They are plotting to get the great war started back up and will offer their services as mercenaries.  They will try to get ingratiated to the nations and then pull an "Order 66", ala starwars and take out the high ranking officers.  I don't think the campaign will progress that far, but They may have a run in with a force from Darguun and perhaps uncover the goblins doing espionage and planting false information to spark then tensions.  Haven't figured out how to mix them in yet.

The Emerald Claw.  A terrorist cult working as patriots for Karrnath.  They are actually agents for Vol.  Are doing various schemes for the greater good of Karnath and Vol..  One overarching theme is Operation Leviathan where they are gathering the shards as I described above.

Lord of Blades: A crazed warforged looking to advanced his race in the world as the dominate race.  He sends his agents after artifacts.  Thinking that if I have some items the PC's are going after, there could be a rival group questing for it.

what am I looking for.  Suggestions on missions I can send people on..  It is a Play by post campaign so I want to have several short missions, unrelated or not,  where they find clues for the over all confrontation in Operation Leviathan.