No.
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There are randomly generated houses in 1.8 that are part of NPC (Non-player character) Villages. These will contain NPC Villages once 1.9 Beta is released. 1.9 has currently got a pre-release available for download, so NPC villagers appear in that.
yes there is, when you first make a world there will be at least three villages, but you have to find them
You can't make villagers without mods. They spawn naturally in so-called NPC villages randomly placed on the map.
A Minecraft world seed is what Minecraft uses to generate the terrain to begin with, it does not create any user-created structures like castles, only things like NPC villages, mines and strongholds.
You can find it in NPC villages or underground dungeons. But the easiest way to get it is to mind regular smooth stone, because that produces a block of cobblestone.