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make sure --username is your email and not your actual username

You can read about Events here on the Forge docs.

In your code, you already check if you are on the server side. Because of that, you can cast your world object to a WorldServer object and then use the following method to spawn your particles. It's much easier than the manual packet thing (which I wouldn't have told you about if I'm not oblivious and had read the WorldServer class). Well, knowledge of packets is always good anyways . /** Spawns the desired particle and sends the necessary packets to the relevant connected players. */ public void spawnParticle(EnumParticleTypes particleType, double xCoord, double yCoord, double zCoord, int numberOfParticles, double xOffset, double yOffset, double zOffset, double particleSpeed, int... particleArguments)

World#spawnParticle(EnumParticleTypes, double, double, double, double, double, double, int...) does nothing on the server, it only spawns particles when called on the client. You need to use one of the spawnParticle overloads from WorldServer instead.

Yes, in the same place you register your mod blocks and items

You need to register the TileEntity using GameRegistry.registerTileEntity() And what do you mean by invincible.

Hey clowcadia check out the GreyGhosts MinecraftByExample it has lots of good examples of items and blocks. https://github.com/TheGreyGhost/MinecraftByExample

No