No. That is impossible.
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Have you port-forwarded? That's needed for Minecraft servers to work (and for most other gaming servers).
There are no cheats to minecraft. Sorry. But you could download and install mods that can help you get what you want.
SDK Planes Mod, I guess you could find it on Minecraft Forums
Yes and no - Iron Doors can't be opened normally, they can only be opened when supplied by charge, which can be provided by levers or buttons, but also by redstone circuitry. Villagers can activate pressure plates, so if you wanted to add Iron Doors to a village, you could set up a system of pressure plates and redstone repeaters to make a door stay open for a few seconds once the plate activates.
I'm not completely sure but there are games known as * FlyFF * Silkroad * Maplestory * World Of Warcraft * Guild Wars Or You Could Play Fake Runescape Servers, Known As Moparscape Servers/ Silabsoft Servers.