Bukkit is an Minecraft Server Hosting software.
You can't
Minecraft commands were first seen in bukkit server. We do not know when the first commands were made for bukkit servers however
There are Bukkit plugins already available to do that on Bukkit Minecraft servers, but they haven't released any information on actually implementing that into the game.
bukkit
wrong bukkit version.
No
you cannot set up permissions in a normal minecraft server. you must have a bukkit server to use permissions. check the bukkit forum for more info.
You can download minecraft plugins from planet minecraft minecraft forums bukkit (for multiplayer) mods for minecraft.com mods for minecraft.net
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You'll need a plugin to do so.
instead of using the jar file from the minecraft website get one called craft bukkit you can find a million tutorial on craft bukkit just use google or youtube