You have to make a furnace by filling in all the slots in your crafting table (besides the middle one) with cobblestone. Then you place your furnace and put sand in the top slot and coal, wood or charcoal in the bottom slot. This will make glass.
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Smelt Cobblestone in your furnace.
You get sand, then you smelt the sand into glass. Simple as that.
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They take the same time.
There is no steel in minecraft. You're referring to iron, and you need to smelt iron ore in a furnace.