i used that seed and found 5 dungeons in a mountain region under the mountains
In caves
They randomly generate throughout the world, to find one just keep digging underground.
You can't make it, you have to find it in dungeon chests.
You cannot make horse armor in Minecraft. Instead, you need to find it in dungeon chests.
You can collect discs in Minecraft to play music. You can either find them in dungeon chests or you can get one when a skeleton shoots a creeper and kills it.
As of Beta 1.4, cocoa beans couldn't be found ingame. You can only find them inside dungeon chests. You can read more about dungeon chests on Minecraft Wiki (the link is under "Sources and related links" below this answer).
a dungeon is found under ground or on land when you are near a dungeon you will hear all Spiders, all Zombies or all skeletons and when you find cobblestone and mossy cobblestone
You can't. You can find two kinds in dungeon chests, or each one can be dropped by creepers if they are killed by a skeleton.
Melons are not found in any biome. You can only find melon seeds in chests that the world generates itself. This includes dungeon chests, abandoned mineshaft chests, and stronghold chests.
There are no horses in Minecraft but if you find a dungeon underground ( Located by mossy stone) You will find a saddle and if you get a saddle place it on a pig by left clicking it. You will have no control over the pig but is quite fun how it spins over and over again.
You get this item inside the theives town dungeon aka the fourth dark world dungeon which is located in the dark world version of kakariko village. You find the mitt in the room next to the one where you find the sage your supposed to save in the dungeon.
There is no way to spawn with a saddle. Saddles are commonly found within dungeon chests. A dungeon has Cobblestone walls Mossy Stone floor and a Mob Spawner in the center. Place a torch on the spawner (If on Easy or higher!) and loot the chest. If you are looking for a seed that spawns you near a dungeon I'd recommend looking at the minecraft forums in the seed topic. You're bound to find one there.
Find the world in your 'saves' folder (which is in your minecraft folder) and copy it to another location, like Documents or Desktop.