Firstly, you must have a block in your hand and not an item/nothing. The default command for placing blocks is right-clicking the mouse.
yea minecraft
he just did create it
yes you can create things like swords
You don't create diamonds, you mine them.
No, Minecraft was created by Notch, the founder of Mojang
you cant
Entertainment.
to put it simply, go on the minecraft website, click create an account... buy game (http://www.minecraft.net)
Create an account from their website.
in the crafting table
You create a world and go into the world in minecraft.
you cant