Westeros: A Game of Thrones.

[The Stranger]

Can you describe what these character stats mean? And why are ships more expensive than armies of thousands?

The traits are pretty much self explanatory. Somebody with a high intrigue is more likely to succeed in a spying mission, somebody with high leadership is more likely to win a battle etc. I don't like putting the exact mechanics in public, interactions between the factions are going to have a bigger effect on the outcome of the game than one extra point of a trait here or there.

This is the most important paragraph in the op:
Westeros: A Game of Thrones is a game that may take some getting used to for many players, much of the game is up to the players to decide. So far as possible, I will try to accept any actions that you wish to attempt. The obvious exception would be orders that include other faction's or NPC characters (orders specifying they behave in a certain way, you can of course target other factions or characters), unless I receive orders from that faction confirming the action.

i dont know about army/ships. but a fleet is always more expensive than a land army. i guess its game mechanics mostly.