Here’s the basic crunch for your setting, the city of Sharn in Breland.
Sharn – The City of Towers
Any other questions you’ve got, this is your resource: http://eberron.wikia.com/wiki/Eberron_Wiki
Races, weapons, countries, history; it’s all here, from the heights of Sharn to the archipelagos of Lhazaar. There’s rather a lot of depth to the world of Eberron. A well-informed player is an efficient player, and a character with setting knowledge is a beautiful thing. So explore the possibilities. Enjoy. And most importantly, DON’T META-GAME.