you just sleep in a bed. how to make a bed? well put three wool over three wooden planks. BUT IF YOUR BED BECOME DESTROYED YOU WILL SPAWN IN YOUR OLD SPAWN POINT!!! So that's it! dream sweat!
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You need singleplayercommands. On teh command bar do /setspawn
First, you need bukkit. Install the Essentials Spawn plugin and type "/setspawn" in the server to set the spawn.
In a vanilla version of Minecraft (unmodded) just build a simple dirt house and make a bed, then when it's dark out you can sleep in it and as long as the bed is unbroken that will be your new spawn point. The last bed you sleep in will be your new spawn point, so you can have multiple beds in different parts of a very large map so you don't have to keep traveling across it to get back to where you were every time you die.There are also different mods you can download that you can twiddle with to manually set any spot in your world to spawn from.
The only way to spawn herobrine in minecraft is to use mods as you cannot spawn him in vanilla minecraft.
If you die in Minecraft and have not placed a bed, you will respawn at your original spawn point. Wherever that may be...