place a 3 by 3 square of tnt and replace the middle one with water. add another ring of any block around the tnt. Place redstone on top of that ring of blocks. To launch, stand in the water and power the redstone.
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You have to have a mod (modification) to make a cannon. It is not in vanilla minecraft.
I personally have found a fun little way to make a cannon in creative mode. You make a hollow tube with a bottom made out of obsidian or bedrock, and put TNT at the bottom and sand at the top. When you activate the TNT, the sand will shoot out.
Make The Girl Sleep in The Bed and Press Shift.
I didn't make Minecraft.
If you are referring to singleplayer mode, yes. Steve/Alex/your player is the only human in minecraft. In the past, "human" mobs were being implemented, but they removed it.