Well if you're talking about a way to blow up TNT the you just have to plant the TNT, put a pressure plate down, and make a path of Redstone dust leading to the TNT. When you step on the Pressure Plate, the TNT goes KABLOOEY! (but you might want to make the plate far away, cuz the explosion is pretty big and can kill you if you get caught in the blast with little or no armor.)
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You can build anything ! but the best will be to build a auto smelter, Here is a link to the tutorial....
Go to a site called minecraft wiki
there are none
There is no such thing as 'straw' in Minecraft. So you can't.
you cant