place it down like any normal block. If you want it to do something though, put it in a line or place the redstone next to eachother.
You mine it from redstone ore.
You get redstone dust and place it on the ground or a block. You can't put redstone wire on walls or roofs.
You need an iron pickaxe to get redstone in Minecraft.
You have to mine redstone ore.
Yes, redstone can activate any type of door in minecraft :)
As of 06/29/14, there are no Redstone Blocks in the PS3 version of Minecraft.
Redstone Blocks now exist in Minecraft 1.5. You can make them by combining nine redstone dust on the crafting table.
It has to be powered by a redstone signal ether next to or below the piston
You can mine redstone with an Iron, Gold or Diamond pickaxe.
Place lever on block then click on it. You will need to have a redstone linked up to it for it to do anything.
Redstone Ore veins are found below layer 16. veins are most common on layer 8. There are 25 ores per chunk on average.Sources: Redstone Ore - Minecraft WikiOre - Minecraft Wiki
The redstone will burn. No questions asked, it burns.