You can't, superflat spawns with,
1 layer of Grass
2 layers of Dirt
1 layer of Bedrock
There's no way that you can get iron without spawning them in.
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You can find iron ingots in chests next to monster spawners. But because monster spawners are rare then it would be a lot easier just to mine until you find some iron the melt it in a furnace! :)
Iron armor, buckets, anything with iron.
3 iron ingots
the ID for iron ingot is 265. Do /give <playername> <ID number> <amount>
You can make bucket, shears, iron tools and armour. Google it if you don't know the recipes.