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yes if they set spawn in the nether, but not many do
Use a spawn egg in creative or look for a nether fotress where they spawn.
You have to spawn it in, or re-generate your nether if you have a pre-1.5 map
Yes, in the Nether Zombie Pigmen spawn on the netherrack but I don't think they spawn on Netherrack in the Overworld.
there are magma cubes but no slimes.
No mobs will spawn on peaceful, you may hear noises but they will be effects even on peaceful. the only entities that spawn in peaceful (not including the nether or the end) are players and animals unless, in the end or nether.
All you really need to do is type in a name of a biome: Rain Forest Swamp Seasonal Forest Forest Savanna Woods Taiga Desert Plains Tundra The Tundra (not really a biome, can not be typed in as a seed but i am stating biomes and technically it is a biome since its weather of lava almost everywhere) All of these can be typed in as a seed (other than The Nether).
There's a monster called a Blaze, they spawn in the Nether, in Nether Fortresses. Blaze Rods are their drop item.and Blazes you can find them in the Nether.and there spawn er. there from the fortress of it and when you put water you can kill it ,because its weakness is water.
Yes, but the Pigmen and Ghasts won't spawn.
Chickens, cows, sheep, wolves, and pigs will spawn on well lit grass in the Overworld. (Not the nether or the end.) Mooshrooms will spawn on Mycelium in the Overworld, Skeletons, creepers, spiders, bats, and zombies spawn in dark places. (Only in the Overworld.) Zombie pigmen and ghasts spawn randomly in the nether. Skeletons, and wither skeletons spawn in nether fortresses, and blazes spawn only near blaze spawners. (Found in nether fortresses.) Ocelots spawn in jungles, and squids spawn underwater in the Overworld. Endermen spawn rarely in dark places in the Overworld, or witha much higher frequency in the end. Cave spiders spawn from spawners found in abondoned mineshafts. Villagers spawn when the map is created and when other villagers breed and have babies. Slimes spawn at low elevations in slime chunks or in swamps. Silverfish spawn from their spawners in one of the worlds three(or less) strongholds. Witches spawn in witch huts when the map is created. One ender dragon spawns in the end when the map is generated. Those are all the mobs which are created naturally, for more information, I advise you go tohttp://www.minecraftwiki.net/wiki/MobsIf all these conditions are fulfilled, and no mobs are spawning, I suggest you press Esc and change your difficulty to easy, medium, or hard, as no monsters spawn while you are in peaceful mode.In creative mode you can also use Spawner Eggs (found in your inventory) to spawn mobs
the seed 1234 will give you village with blacksmith and a stronghold at spawn
it spawns natrally. the seed nether has 2 lavafalls in it.