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First, you need bukkit. Install the Essentials Spawn plugin and type "/setspawn" in the server to set the spawn.
You need singleplayercommands. On teh command bar do /setspawn
its not a mod its a BED
If the difficulty isn't set to peaceful, mobs will spawn in creative mode.
press / (next to full stop) and type 'time set 0' then press enter. if you want to make it night type 'time set 140000' and press enter. Or you could install the too many items mod and do it with that.