You don't make diamonds (unless, probably, if you have Tekkit), you find them. I suggest mining around lava pools or mining 7-12 blocks above bedrock, as a whole lot of other goodies and stuff is around that area.
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Nope, you have to mine for diamonds with an iron pickaxe.
It takes 26 diamonds to make the armour and 11 for the tools, that's 38 diamonds in total.
You can make a diamond sword in Minecraft by placing two diamonds above a stick in the crafting table.
Diamonds are located near a natural lava source. Making your own lava source does not magically make diamonds appear.
Five diamonds in an upside-down pattern U D= Diamonds *=Air D|D|D D|*|D *|*|*