You make one with 8 cobblestone.
Recipie:
X = Cobblestone
O = Nothing
XXX
XOX
XXX
To access a furnace in minecraft, simply click it!!!! Its that easy!!
Press E. It should leave the furnace GUI.
Just dig and keep digging until you find iron ore then smelt it in a furnace to get iron.
You can't...
When you mine regular 'smooth' stone, you get cobblestone. This can be converted back to smooth stone by smelting it in a furnace.
You automatically get 1
yes
Smelt Cobblestone in your furnace.
Burn cactus in a furnace.
You put cobblestone in a furnace with something to cook it with
You put sand in a furnace
Shift while you place it.